https://wiki.algebra.com/api.php?action=feedcontributions&user=64.94.157.1&feedformat=atomAlgebra.Com's Help - User contributions [en]2022-08-14T09:46:07ZUser contributionsMediaWiki 1.28.0https://wiki.algebra.com/index.php?title=Igor%27s_TODO_list&diff=1983Igor's TODO list2007-08-09T14:29:25Z<p>64.94.157.1: </p>
<hr />
<div>* Add a relationship between tutors and students "My Adopted Students".<br />
* Add self study courses<br />
* Make sure that every section has a Quiz.</div>64.94.157.1https://wiki.algebra.com/index.php?title=Igor%27s_TODO_list&diff=1982Igor's TODO list2007-08-09T14:26:49Z<p>64.94.157.1: </p>
<hr />
<div>* Add a relationship between tutors and students "My Adopted Students".<br />
* Add self study courses<br />
* Make sure that every section has a Quiz</div>64.94.157.1https://wiki.algebra.com/index.php?title=Daily_problem_posting_limit&diff=1361Daily problem posting limit2006-04-20T13:34:06Z<p>64.94.157.1: </p>
<hr />
<div>I added a daily limit for posting problems to algebra.com. The goal is twofold, <br />
<br />
<br />
* to prevent people from wholesale homework cheating<br />
* to prevent people from "drowning out" others and unfairly grabbing too much attention from tutors</div>64.94.157.1https://wiki.algebra.com/index.php?title=Miscellaneous_Site_Updates&diff=1340Miscellaneous Site Updates2006-04-20T13:33:00Z<p>64.94.157.1: </p>
<hr />
<div>*[[Access Counts]]<br />
*[[Including problems into lessons]]<br />
*[[Thank you messages displayed in tutor profiles]]<br />
*[[ISBN help]]<br />
*[[Textbook information]]<br />
*[[Daily problem posting limit]]</div>64.94.157.1https://wiki.algebra.com/index.php?title=Textbook_information&diff=1358Textbook information2006-03-22T15:37:25Z<p>64.94.157.1: </p>
<hr />
<div>Students who submit math questions to our [http://www.algebra.com/tutors/ free math tutors], know that algebra.com asks them for information on their textbook. <br />
<br />
Why? This page explains it. <br />
<br />
I want to store questions and answers by textbook. That way, future students who visit algebra.com, will be able to look up solutions for their textbook. It will help them to find help on their study materials. It will also help reuse the extremely valuable work that our tutors do, freeing them to work on new stuff rather than redo what has already been done. <br />
<br />
No one should get something for nothing, so, students who ask math questions can as well do a little effort and post information on what textbook their problem comes from. <br />
<br />
Practically speaking, those who identify their textbook and chapter will be given priority access to the "queue" of problems and will be more likely to have their problems answered. To make your life easy, algebra.com will remember your textbook information in your "cookie", for up to a week. So, you only have to type it once and it will be good for several days. <br />
<br />
* [[ISBN help|How to find ISBN numbers]]</div>64.94.157.1https://wiki.algebra.com/index.php?title=ISBN_help&diff=357ISBN help2006-03-22T15:36:15Z<p>64.94.157.1: </p>
<hr />
<div>This page explains how to find ISBN number on a textbook. <br />
<br />
Take a textbook, and look at the back side of the cover. You should see a bar code in the bottom right corner. Above it, there is a ten digit number, maybe with a letter, like this: 0471975230, or 0-13-490012-X. Just type it exactly how it appears in the book.<br />
<br />
http://www.algebra.com/images/isbn.jpg<br />
<br />
* Back to [[Textbook information]]<br />
* [http://en.wikipedia.org/wiki/Isbn Read more about ISBN numbers]</div>64.94.157.1https://wiki.algebra.com/index.php?title=ISBN_help&diff=351ISBN help2006-03-21T21:12:25Z<p>64.94.157.1: </p>
<hr />
<div>This page explains how to find ISBN number on a textbook. <br />
<br />
Take a textbook, and look at the back side of the cover. You should see a bar code in the bottom right corner. Above it, there is a ten digit number, maybe with a letter, like this: 0471975230, or 0-13-490012-X. Just type it exactly how it appears in the book.<br />
<br />
* Back to [[Textbook information]]<br />
* [http://en.wikipedia.org/wiki/Isbn Read more about ISBN numbers]</div>64.94.157.1https://wiki.algebra.com/index.php?title=ISBN_help&diff=350ISBN help2006-03-21T18:43:50Z<p>64.94.157.1: </p>
<hr />
<div>This page explains how to find ISBN number on a textbook. <br />
<br />
Take a textbook, and look at the back side of the cover. You should see a bar code in the bottom right corner. Above it, there is a ten digit number, maybe with a letter, like this: 0471975230, or 0-13-490012-X. Just type it exactly how it appears in the book.<br />
<br />
* Back to [[Textbook information]]</div>64.94.157.1https://wiki.algebra.com/index.php?title=Textbook_information&diff=353Textbook information2006-03-21T18:39:13Z<p>64.94.157.1: </p>
<hr />
<div>Students who submit math questions to our [http://www.algebra.com/tutors/ free math tutors], know that algebra.com asks them for information on their textbook. <br />
<br />
Why? This page explains it. <br />
<br />
I want to store questions and answers by textbook. That way, future students who visit algebra.com, will be able to look up solutions for their textbook. It will help them to find help on their study materials. <br />
<br />
No one should get something for nothing, so, students who ask math questions can as well do a little effort and post information on what textbook their problem comes from. <br />
<br />
Practically speaking, those who identify their textbook and chapter will be given priority access to the "queue" of problems and will be more likely to have their problems answered. To make your life easy, algebra.com will remember your textbook information in your "cookie", for up to a week. So, you only have to type it once and it will be good for several days. <br />
<br />
* [[ISBN help|How to find ISBN numbers]]</div>64.94.157.1https://wiki.algebra.com/index.php?title=Miscellaneous_Site_Updates&diff=361Miscellaneous Site Updates2006-03-21T18:34:24Z<p>64.94.157.1: </p>
<hr />
<div>*[[Access Counts]]<br />
*[[Including problems into lessons]]<br />
*[[Thank you messages displayed in tutor profiles]]<br />
*[[ISBN help]]<br />
*[[Textbook information]]</div>64.94.157.1https://wiki.algebra.com/index.php?title=ISBN_help&diff=349ISBN help2006-03-21T18:21:37Z<p>64.94.157.1: </p>
<hr />
<div>This page explains how to find ISBN number on a textbook. <br />
<br />
Take a textbook, and look at the back side of the cover. You should see a bar code in the bottom right corner. Above it, there is a ten digit number, maybe with a letter, like this: 0471975230, or 0-13-490012-X. Just type it exactly how it appears in the book.</div>64.94.157.1https://wiki.algebra.com/index.php?title=ISBN_help&diff=347ISBN help2006-03-21T18:21:01Z<p>64.94.157.1: </p>
<hr />
<div>This page explains how to find ISBN number on a textbook. <br />
<br />
Take a textbook, and look at the back side of the cover. You should see a bar code. Above it, there is a ten digit number like this: 0471975230, or 0-13-490012-X. Just type it exactly how it appears in the book.</div>64.94.157.1https://wiki.algebra.com/index.php?title=Miscellaneous_Site_Updates&diff=348Miscellaneous Site Updates2006-03-21T18:18:59Z<p>64.94.157.1: </p>
<hr />
<div>*[[Access Counts]]<br />
*[[Including problems into lessons]]<br />
*[[Thank you messages displayed in tutor profiles]]<br />
*[[ISBN help]]</div>64.94.157.1https://wiki.algebra.com/index.php?title=Thank_you_messages_displayed_in_tutor_profiles&diff=1356Thank you messages displayed in tutor profiles2006-03-20T19:12:02Z<p>64.94.157.1: </p>
<hr />
<div>Students that see solutions to their problems, are encouraged to send thank you notes to tutors (we, after all, are not paid and need some encouragement) <br />
<br />
Now students have a choice to make thank you messages public. The student can select the "MAKE PUBLIC" checkbox and, if it is selected, the message would appear in the tutor's profile. <br />
<br />
Tutors are able to make these messages invisible by setting their own privacy flag to private. <br />
<br />
This is a nice opportunity for tutors to get some nice feedback in their profiles. <br />
<br />
Example: <br />
<br />
[http://www.algebra.com/tutors/aboutme.mpl?userid=ikdeep ikdeep's profile]</div>64.94.157.1https://wiki.algebra.com/index.php?title=Miscellaneous_Site_Updates&diff=346Miscellaneous Site Updates2006-03-20T19:08:40Z<p>64.94.157.1: </p>
<hr />
<div>*[[Access Counts]]<br />
*[[Including problems into lessons]]<br />
*[[Thank you messages displayed in tutor profiles]]</div>64.94.157.1https://wiki.algebra.com/index.php?title=Quality_standards&diff=1309Quality standards2006-01-30T15:27:15Z<p>64.94.157.1: </p>
<hr />
<div>This site is about helping children learn math. It is not about providing an easy way to cheat on homework. Students come here hoping to cheat on their homework, but they should get more than they were hoping for. The standards are designed with this in mind.<br />
<br />
This defines standards for both [[Solvers]] and [[Lessons]]. <br />
<br />
A solver or lesson must follow the principle of CCCP. It should be:<br />
<br />
*Complete. That does not mean that they should discuss everything under the sun, but no important cases should be left out.<br />
*Correct. A lesson or solver should not be wrong.<br />
*Concise. A discussion of your uncle's 1972 fishing trip probably should be included.<br />
*Precise. They could contain any explanations that could help average students, but they should have mathematically correct definitions.<br />
<br />
All solvers mush show work. A solver that does not show work is invalid.</div>64.94.157.1https://wiki.algebra.com/index.php?title=Talk:Quality_standards&diff=1364Talk:Quality standards2006-01-30T15:26:52Z<p>64.94.157.1: </p>
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<div></div>64.94.157.1https://wiki.algebra.com/index.php?title=Defining_solvers&diff=1299Defining solvers2006-01-30T15:25:44Z<p>64.94.157.1: </p>
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<div>A [[Solvers | solver]] is text with computer instrictions, that defines how to solve a particular math problem. It has to be formatted in a particular way, to make my server understand it. You can view source code of every solver on my site, to see how other solvers are done. <br />
<br />
This language was designed with ease of use in mind. The goal is to make any intelligent human being, such as a college student or a math teacher or an advanced school student, to begin contributing with the minimum of hassle and learning curve. I need your help in making this system better, so if you have any suggestions, write me at ichudov@algebra.com.<br />
<br />
To create a solver, you would visit a section of algebra.com, (such as this [http://www.algebra.com/algebra/homework/playground/ playground] where you can mess with anything), where it would be apropriate, click on "Add Solver". You will then create a solver in the "development" area, and play with it until you like it. It will not be visible to others. Then you would add a validation (check) section, vallidate the solver, and promote it to production.<br />
<br />
You can view source of any solver, which will hopefully help you understand how they work.<br />
<br />
Complete history of all updates will be kept.<br />
<br />
These pages explain what solvers are and how to define them.<br />
----<br />
A solver must contain several sections.<br />
<br />
* [[Solver input section | Input section]]<br />
* [[Solver solution section | Solution section]] (quick jump to [[Defining perl solution]] and [[Defining markup solution]]<br />
* [[Solver output section | Output section]]<br />
* [[Solver check section | Check section]]</div>64.94.157.1https://wiki.algebra.com/index.php?title=Talk:Defining_solvers&diff=1366Talk:Defining solvers2006-01-30T15:24:38Z<p>64.94.157.1: </p>
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<div></div>64.94.157.1https://wiki.algebra.com/index.php?title=Talk:Main_Page&diff=269Talk:Main Page2005-12-13T15:06:08Z<p>64.94.157.1: </p>
<hr />
<div></div>64.94.157.1https://wiki.algebra.com/index.php?title=Algebra.Com%27s_Help:About&diff=256Algebra.Com's Help:About2005-11-29T18:57:15Z<p>64.94.157.1: </p>
<hr />
<div></div>64.94.157.1https://wiki.algebra.com/index.php?title=Algebra.Com%27s_Help:General_disclaimer&diff=255Algebra.Com's Help:General disclaimer2005-11-29T18:56:23Z<p>64.94.157.1: </p>
<hr />
<div></div>64.94.157.1https://wiki.algebra.com/index.php?title=Solvers&diff=1307Solvers2005-10-27T18:17:19Z<p>64.94.157.1: </p>
<hr />
<div>Algebra.com offers intelligent people a unique opportunity to use your brains. You can define solvers for any problems of, more or less, any complexity. You can define solvers for algebra problems.<br />
<br />
You will be able to write your own lessons and solvers, in an easy to understand way (similar to the way you are solving homework problems). I have [http://www.algebra.com/misc/about/stats/ thousands of children visiting every day], and therefore your creative efforts will have a great impact on many children needing math help. So you would be able to create [http://www.algebra.com/services/rendering nice looking formulae and graphs], plus I will add a function to upload your own images. The solvers would refer to one another, so a typical word problem solver could invoke a linear system solver or a quadratic solver (which would complete the solving job) without you having to replicate basic stuff. Your lessons and solvers will bear your name, picture, link to your site and your score will increase every time a solver or lesson is used. Scores should not matter, but a lesson or a solver is harder to write and a score should reflect that. The goal is to improve children's understanding of algebra, not to help them cheat on homework. <br />
<br />
Right now the solver system is in beta. I am working hard on this feature, and it should be fully operational within days. Write me at ichudov AT algebra DOT com with your suggestions.<br />
<br />
*[http://www.algebra.com/algebra/homework/playground/ A playground] where you you can play with solvers<br />
*Help on [[Defining solvers]]<br />
*[[Tutoring copyright | A note on copyright]]<br />
*[[Quality standards]]</div>64.94.157.1https://wiki.algebra.com/index.php?title=Help:Contents&diff=1345Help:Contents2005-10-27T18:13:29Z<p>64.94.157.1: </p>
<hr />
<div></div>64.94.157.1https://wiki.algebra.com/index.php?title=Algebra.Com%27s_Help_talk:About&diff=231Algebra.Com's Help talk:About2005-10-27T18:12:04Z<p>64.94.157.1: </p>
<hr />
<div></div>64.94.157.1https://wiki.algebra.com/index.php?title=Algebra.Com%27s_Help_talk:General_disclaimer&diff=1338Algebra.Com's Help talk:General disclaimer2005-10-27T18:11:46Z<p>64.94.157.1: </p>
<hr />
<div></div>64.94.157.1https://wiki.algebra.com/index.php?title=Talk:Igor%27s_TODO_list&diff=233Talk:Igor's TODO list2005-10-27T18:11:02Z<p>64.94.157.1: </p>
<hr />
<div></div>64.94.157.1https://wiki.algebra.com/index.php?title=Plotting_Formulas&diff=334Plotting Formulas2005-10-03T19:12:25Z<p>64.94.157.1: </p>
<hr />
<div>This page discusses our math formula plotting system. <br />
<br />
<div class="boilerplate metadata" id="cleanup" style="text-align: center; background: #efefff; margin: .5em 10%; padding: .3em 1em; border: #9F9FFF 1px solid;">For details on numerous features, see '''[[Formula plotting feature guide]]''', or [http://www.algebra.com/services/rendering/ click here for examples and practice].</DIV><br />
<br />
----<br />
Algebra.com has a nice feature where tutors who create their solvers, lessons and answer user questions, can enter simple text and have it drawn as nice mathematical formulas. Unlike the LaTEX based system that is used in [http://en.wikipedia.org/ Wikipedia], for example [http://www.algebra.com/algebra/homework/quadratic/Quadratic-equation.wikipedia in this quadratic equation page], my system is easy to use for any student or school teacher. <br />
<br />
That said, I also have a [[tex|TeX support]] also, for TeX fans.<br />
<br />
'''My formula plotter does a lot more than you might expect. See the [[Formula plotting feature guide|guide]].'''<br />
<br />
----<br />
Formulas are entered using symbols {{{ and }}} (curly braces). They tell my server that the text you are entering is not simple text, but instead should be drawn as a formula. Example of a formula: {{{ x = sqrt( (y-z)/(y+z) ) = 2 }}}. I have a special page where you can [http://www.algebra.com/services/rendering/ practice entering formulas].<br />
<br />
----<br />
<br />
* Multiplication. You do not need to enter a multiplication sign between a number and symbols: for example, 5+2ax is a perfectly valid formula. Use "*" for explicit multiplication.<br />
<br />
* Exponentiation. "^" is the exponentiation sign. For example, x^2+2x+3 is a legitimate quadratic formula.<br />
<br />
* Division. If you use a / sign (slash symbol), the formula will be drawn with the numerator, line and denominator. If you use a ":" sign (colon symbol), numerator and denominator will be on one line.<br />
<br />
* Graphing. You can draw simple graphs instantly by using a special function called "graph". It has the following arguments:<br />
<br />
graph( xsize, ysize, xmin, xmax, ymin, ymax, func1, func2... )<br />
<br />
xsize and ysize are dimensions of the graph in pixels. xmin, xmax, ymin and ymax define the area of the coordinate plane that is being drawn. The list of functions that follow, are expressions involving only one parameter, x.<br />
<br />
* An expression can span several lines. For example:<br />
<br />
graph( 300, 200, <br />
-5, 5, -5, 5,<br />
x-2, <br />
x^2-3x<br />
)<br />
<br />
So, format your expressions as you like.<br />
<br />
* [[Formula plotting feature guide]] for details on numerous other features</div>64.94.157.1https://wiki.algebra.com/index.php?title=Main_Page&diff=185Main Page2005-07-18T21:39:54Z<p>64.94.157.1: </p>
<hr />
<div>Welcome to [http://www.algebra.com Algebra.Com]'s help pages. These pages are not for math help, they are for help with using features of this site such as defining lessons, solvers and so on.<br />
<br />
*[[Tutoring|Free Tutoring]] -- become famous and help children in need. Your answers will remain public forever!<br />
*[[Solvers| Our unique public '''Solver System''']]<br />
*[[Lessons| You can write '''lessons''', or even a whole algebra textbook]], to be seen by thousands<br />
*[[Feature Requests|Ask for a new feature here!]]<br />
*[[Plotting Formulas|Help with '''plotting formulas''']]<br />
*[[Simplifier|Help with the '''Universal Simplifier''']]</div>64.94.157.1https://wiki.algebra.com/index.php?title=Formula_plotting-students&diff=1334Formula plotting-students2005-07-15T15:58:04Z<p>64.94.157.1: </p>
<hr />
<div>{{Formula}}<br />
<br />
Most websites use forums that are not suitable for math and make it very difficult to enter formulas in questions and in text. Not so on [http://www.algebra.com Algebra.Com].<br />
<br />
When you submit a question, you can use powerful [[Plotting Formulas|formula notation]], '''if you want to'''. You only need to know a few things about this huge system.<br />
<br />
Enclose formulas into {{{ }}}. If you get stuck entering a valid formula, just remove {{{ and }}} and let the tutors figure it out. But your problem looks much better when formulas are displayed as they would be on your school blackboard.<br />
<br />
Squares and powers are entered using the CARET symbol:<br />
<br />
{{{ x^2-2x-3 }}}<br />
{{{ x^y }}}<br />
<br />
'''Square root''' is entered using the sqrt function notation<br />
<br />
{{{ sqrt( b^2-4ac ) }}}<br />
<br />
'''Logarithm''' is entered using "log" function notation<br />
<br />
{{{ log( 2, x ) }}} <-- logarithm of x with base 2<br />
{{{ log( y ) }}} <-- logarithm of y without base<br />
<br />
Multiplication is entered using *, division is entered using /.<br />
<br />
Equations and inequalities are entered using =, <, >, >=, <= signs:<br />
<br />
{{{ x = sqrt( y^2+1 ) }}}<br />
{{{ x >= sqrt( y^2+1 ) }}}<br />
{{{ x <= sqrt( y^2+1 ) }}}<br />
{{{ x >= sqrt( y^2+1 ) }}}<br />
<br />
'''Use parentheses ( and ) properly!'''. Rememver the a+b/c+d means something else than (a+b)/(c+d)!<br />
<br />
Examples:<br />
<br />
(a+b)/(c+d) <--- a plus b, DIVIDED by c plus d<br />
(x^2-1)/(x-1)<br />
sqrt( 28 ) <--- square root of 28<br />
sin( x ) + cos( x ) <--- sine function of x plus cosine of x</div>64.94.157.1https://wiki.algebra.com/index.php?title=Formula_plotting-students&diff=162Formula plotting-students2005-07-15T15:57:36Z<p>64.94.157.1: </p>
<hr />
<div>{{Formula}}<br />
<br />
Most websites use forums that are not suitable for math and make it very difficult to enter formulas in questions and in text. Not so on [http://www.algebra.com Algebra.Com].<br />
<br />
When you submit a question, you can use powerful [[Plotting Formulas|formula notation]], '''if you want to'''. You only need to know a few things about this huge system.<br />
<br />
Enclose formulas into {{{ }}}. If you get stuck entering a valid formula, just remove {{{ and }}} and let the tutors figure it out. But your problem looks much better when formulas are displayed as they would be on your school blackboard.<br />
<br />
Squares and powers are entered using the CARET symbol:<br />
<br />
{{{ x^2-2x-3 }}}<br />
{{{ x^y }}}<br />
<br />
'''Square root''' is entered using the sqrt function notation<br />
<br />
{{{ sqrt( b^2-4ac ) }}}<br />
<br />
'''Logarithm''' is entered using "log" function notation<br />
<br />
{{{ log( 2, x ) }}} <-- logarithm of x with base 2<br />
{{{ log( y ) }}} <-- ogarithm of y without base<br />
<br />
Multiplication is entered using *, division is entered using /.<br />
<br />
Equations and inequalities are entered using =, <, >, >=, <= signs:<br />
<br />
{{{ x = sqrt( y^2+1 ) }}}<br />
{{{ x >= sqrt( y^2+1 ) }}}<br />
{{{ x <= sqrt( y^2+1 ) }}}<br />
{{{ x >= sqrt( y^2+1 ) }}}<br />
<br />
'''Use parentheses ( and ) properly!'''. Rememver the a+b/c+d means something else than (a+b)/(c+d)!<br />
<br />
Examples:<br />
<br />
(a+b)/(c+d) <--- a plus b, DIVIDED by c plus d<br />
(x^2-1)/(x-1)<br />
sqrt( 28 ) <--- square root of 28<br />
sin( x ) + cos( x ) <--- sine function of x plus cosine of x</div>64.94.157.1https://wiki.algebra.com/index.php?title=Formula_plotting-students&diff=161Formula plotting-students2005-07-15T15:54:55Z<p>64.94.157.1: </p>
<hr />
<div>{{Formula}}<br />
<br />
Most websites make it very difficult to enter formulas in questions and in text. Not so on [http://www.algebra.com Algebra.Com].<br />
<br />
When you submit a question, you can use powerful [[Plotting Formulas|formula notation]], '''if you want to'''. You only need to know a few things about this huge system.<br />
<br />
Enclose formulas into {{{ }}}. If you get stuck entering a valid formula, just remove {{{ and }}} and let the tutors figure it out. But your problem looks much better when formulas are displayed as they would be on your school blackboard.<br />
<br />
Squares and powers are entered using the CARET symbol:<br />
<br />
{{{ x^2-2x-3 }}}<br />
{{{ x^y }}}<br />
<br />
'''Square root''' is entered using the sqrt function notation<br />
<br />
{{{ sqrt( b^2-4ac ) }}}<br />
<br />
'''Logarithm''' is entered using "log" function notation<br />
<br />
{{{ log( 2, x ) }}} <-- logarithm of x with base 2<br />
{{{ log( y ) }}} <-- ogarithm of y without base<br />
<br />
Multiplication is entered using *, division is entered using /.<br />
<br />
Equations and inequalities are entered using =, <, >, >=, <= signs:<br />
<br />
{{{ x = sqrt( y^2+1 ) }}}<br />
{{{ x >= sqrt( y^2+1 ) }}}<br />
{{{ x <= sqrt( y^2+1 ) }}}<br />
{{{ x >= sqrt( y^2+1 ) }}}<br />
<br />
'''Use parentheses ( and ) properly!'''. Rememver the a+b/c+d means something else than (a+b)/(c+d)!<br />
<br />
Examples:<br />
<br />
(a+b)/(c+d) <--- a plus b, DIVIDED by c plus d<br />
(x^2-1)/(x-1)<br />
sqrt( 28 ) <--- square root of 28<br />
sin( x ) + cos( x ) <--- sine function of x plus cosine of x</div>64.94.157.1https://wiki.algebra.com/index.php?title=Formula_plotting-students&diff=160Formula plotting-students2005-07-15T15:54:13Z<p>64.94.157.1: </p>
<hr />
<div>{{Formula}}<br />
<br />
Most websites make it very difficult to enter formulas in questions and in text. Not so on [http://www.algebra.com Algebra.Com].<br />
<br />
When you submit a question, you can use powerful [[Plotting Formulas|formula notation]], '''if you want to'''. You only need to know a few things about this huge system.<br />
<br />
Enclose formulas into {{{ }}}. If you get stuck entering a valid formula, just remove {{{ and }}} and let the tutors figure it out. But your problem looks much better when formulas are displayed as they would be on your school blackboard.<br />
<br />
Squares and powers are entered using the CARET symbol:<br />
<br />
{{{ x^2-2x-3 }}}<br />
{{{ x^y }}}<br />
<br />
'''Square root''' is entered using the sqrt function notation<br />
<br />
{{{ sqrt( b^2-4ac ) }}}<br />
<br />
'''Logarithm''' is entered using "log" function notation<br />
<br />
{{{ log( 2, x ) }}}<br />
{{{ log( y ) }}}<br />
<br />
Multiplication is entered using *, division is entered using /.<br />
<br />
Equations and inequalities are entered using =, <, >, >=, <= signs:<br />
<br />
{{{ x = sqrt( y^2+1 ) }}}<br />
{{{ x >= sqrt( y^2+1 ) }}}<br />
{{{ x <= sqrt( y^2+1 ) }}}<br />
{{{ x >= sqrt( y^2+1 ) }}}<br />
<br />
'''Use parentheses ( and ) properly!'''. Rememver the a+b/c+d means something else than (a+b)/(c+d)!<br />
<br />
Examples:<br />
<br />
(a+b)/(c+d) <--- a plus b, DIVIDED by c plus d<br />
(x^2-1)/(x-1)<br />
sqrt( 28 ) <--- square root of 28<br />
sin( x ) + cos( x ) <--- sine function of x plus cosine of x</div>64.94.157.1https://wiki.algebra.com/index.php?title=Formula_plotting-students&diff=159Formula plotting-students2005-07-15T15:26:33Z<p>64.94.157.1: </p>
<hr />
<div>{{Formula}}<br />
<br />
Most websites make it very difficult to enter formulas in questions and in text. Not so on [http://www.algebra.com Algebra.Com].<br />
<br />
When you submit a question, you can use powerful [[Plotting Formulas|formula notation]], '''if you want to'''. You only need to know a few things about this huge system.<br />
<br />
Enclose formulas into {{{ }}}. If you get stuck entering a valid formula, just remove {{{ and }}} and let the tutors figure it out. But your problem looks much better when formulas are displayed as they would be on your school blackboard.<br />
<br />
Squares are entered using the CARET symbol:<br />
<br />
{{{ x^2-2x-3 }}}<br />
<br />
Square root is entered using the sqrt function notation<br />
<br />
{{{ sqrt( b^2-4ac ) }}}<br />
<br />
Multiplication is entered using *, division is entered using /.<br />
<br />
Equations and inequalities are entered using =, <, >, >=, <= signs:<br />
<br />
{{{ x = sqrt( y^2+1 ) }}}<br />
{{{ x >= sqrt( y^2+1 ) }}}<br />
{{{ x <= sqrt( y^2+1 ) }}}<br />
{{{ x >= sqrt( y^2+1 ) }}}<br />
<br />
'''Use parentheses ( and ) properly!'''. Rememver the a+b/c+d means something else than (a+b)/(c+d)!<br />
<br />
Examples:<br />
<br />
(a+b)/(c+d) <--- a plus b, DIVIDED by c plus d<br />
(x^2-1)/(x-1)<br />
sqrt( 28 ) <--- square root of 28<br />
sin( x ) + cos( x ) <--- sine function of x plus cosine of x</div>64.94.157.1https://wiki.algebra.com/index.php?title=Formula_plotting-students&diff=158Formula plotting-students2005-07-15T15:21:36Z<p>64.94.157.1: </p>
<hr />
<div>{{Formula}}<br />
<br />
Most websites make it very difficult to enter formulas in questions and in text. Not so on [http://www.algebra.com Algebra.Com].<br />
<br />
When you submit a question, you can use powerful [[Plotting Formulas|formula notation]]. You only need to know a few things about this huge system.<br />
<br />
Enclose formulas into {{{ }}}. If you get stuck entering a valid formula, just remove {{{ and }}} and let the tutors figure it out. But your problem looks much better when formulas are displayed as they would be on your school blackboard.<br />
<br />
Squares are entered using the CARET symbol:<br />
<br />
{{{ x^2-2x-3 }}}<br />
<br />
Square root is entered using the sqrt function notation<br />
<br />
{{{ sqrt( b^2-4ac ) }}}<br />
<br />
Equations and inequalities are entered using =, <, >, >=, <= signs:<br />
<br />
{{{ x = sqrt( y^2+1 ) }}}<br />
{{{ x >= sqrt( y^2+1 ) }}}<br />
{{{ x <= sqrt( y^2+1 ) }}}<br />
{{{x >= sqrt( y^2+1 )}}}</div>64.94.157.1https://wiki.algebra.com/index.php?title=Formula_plotting-students&diff=157Formula plotting-students2005-07-15T15:20:57Z<p>64.94.157.1: </p>
<hr />
<div>{{Formula}}<br />
<br />
Most websites make it very difficult to enter formulas in questions and in text. Not so on [http://www.algebra.com Algebra.Com].<br />
<br />
When you submit a question, you can use powerful [[Plotting Formulas|formula notation]]. You only need to know a few things about this huge system.<br />
<br />
Enclose formulas into {{{ }}}. If you get stuck entering a valid formula, just remove {{{ and }}} and let the tutors figure it out. But your problem looks much better when formulas are displayed as they would be on your school blackboard.<br />
<br />
Squares are entered using the CARET symbol:<br />
<br />
{{{x^2-2x-3}}}<br />
<br />
Square root is entered using the sqrt function notation<br />
<br />
{{{sqrt( b^2-4ac )}}}<br />
<br />
Equations and inequalities are entered using =, <, >, >=, <= signs:<br />
<br />
{{{x = sqrt( y^2+1 )}}}<br />
{{{x >= sqrt( y^2+1 )}}}<br />
{{{x <= sqrt( y^2+1 )}}}<br />
{{{x >= sqrt( y^2+1 )}}}</div>64.94.157.1https://wiki.algebra.com/index.php?title=Formula_plotting-students&diff=156Formula plotting-students2005-07-15T15:18:00Z<p>64.94.157.1: </p>
<hr />
<div>{{Formula}}<br />
<br />
Most websites make it very difficult to enter formulas in questions and in text. Not so on [http://www.algebra.com Algebra.Com].<br />
<br />
When you submit a question, you can use powerful [[Plotting Formulas|formula notation]]. You only need to know a few things about this huge system.<br />
<br />
Enclose formulas into {{{ }}}.</div>64.94.157.1https://wiki.algebra.com/index.php?title=Formula_plotting_feature_guide&diff=199Formula plotting feature guide2005-07-15T15:15:36Z<p>64.94.157.1: </p>
<hr />
<div>{{Formula}}<br />
<br />
* '''Powers''' are entered using the ^ symbol: x^2 means x SQUARED. x^(y+2) means x to the power of (y+2). <br />
* The '''plus/minus symbol''' is entered as "+- ", note the SPACE after +-. SPACE is mandatory!<br />
* '''Subscripts''' are entered using the [ and ]: example: x[1,2] = a+-b<br />
* '''Graphs''', see [[Formula plotting-graphs | Instructions]] and [http://www.algebra.com/services/rendering/regression.mpl?f=graphs.txt Examples]<br />
* '''Diagrams and drawings''', see [[Formula plotting-drawings|Instructions]] and [http://www.algebra.com/services/rendering/regression.mpl?f=drawings.txt Examples].<br />
* '''Cartoons''' (explaining simplification etc), see [[Formula plotting-cartoons|Instructions]] and [http://www.algebra.com/services/rendering/regression.mpl?f=cartoons.txt Examples]<br />
* '''Simplifier cartoons''' (universal simplifier performing '''automatic''' simplification and showing cartoons), see [[Formula plotting-simplifier cartoons|Instructions]] and [http://www.algebra.com/services/rendering/simplifier.mpl Examples].<br />
* '''Arithmetic cartoons''' (explaining addition etc) see [[Formula plotting-arithmetic cartoons|Instructions]] and [http://www.algebra.com/services/rendering/regression.mpl?f=arithmetic.txt Examples]<br />
* '''Greek letters''', summation, integrals etc are entered using their common names. [http://www.algebra.com/services/rendering/regression.mpl?f=special.txt Examples]<br />
* '''Matrices''', see [[Formula plotting-matrices|Instructions]] and [http://www.algebra.com/services/rendering/regression.mpl?f=special.txt Examples].<br />
* '''Special math notation''', such as sums, integrals, logarithms, limit etc, see [[Formula plotting-special symbols|Instructions]] of [http://www.algebra.com/services/rendering/regression.mpl?f=special.txt Examples].<br />
* Simplified [[Formula plotting-students|instructions for students submitting homework questions]].</div>64.94.157.1https://wiki.algebra.com/index.php?title=Tutoring-thank_you_notes&diff=1333Tutoring-thank you notes2005-07-13T19:47:22Z<p>64.94.157.1: </p>
<hr />
<div>This relates to our [[Tutoring|tutoring]] system . When a tutor posts a solution to a problem, the student is notified by email. The email sends the student to a special page where he or she can see the solution. There is a box to send a thank you note to the tutor, where a student can say thank you or solicit paid help or ask for clarification.<br />
<br />
*[http://www.algebra.com/tutors/ Tutoring Website]</div>64.94.157.1https://wiki.algebra.com/index.php?title=Tutoring-thank_you_notes&diff=154Tutoring-thank you notes2005-07-13T19:46:30Z<p>64.94.157.1: </p>
<hr />
<div>This relates to our [[Tutoring|tutoring]] system. When a tutor posts a solution to a problem, the student is notified by email. The email sends the student to a special page where he or she can see the solution. There is a box to send a thank you note to the tutor, where a student can say thank you or solicit paid help or ask for clarification.</div>64.94.157.1https://wiki.algebra.com/index.php?title=Tutoring&diff=165Tutoring2005-07-13T19:36:17Z<p>64.94.157.1: </p>
<hr />
<div>Algebra.com's [http://www.algebra.com/tutors/ tutoring system] is explained here. This page exists to explain how the system works and help tutors perform their tasks.<br />
<br />
I have a unique system where any intelligent person could solve problems submitted by students. These answers will stay public forever, in the relevant algebra modules. <br />
<br />
Algebra.com's tutors can use a [[Plotting Formulas|formula plotting system]] to easily create beautiful math formulas in their explanation, draw cartoons etc.<br />
<br />
After receiving an answer, students send [[Tutoring-thank you notes|thank you notes]], where they can say thank you or even solicit paid help.</div>64.94.157.1https://wiki.algebra.com/index.php?title=Main_Page&diff=163Main Page2005-07-13T19:33:21Z<p>64.94.157.1: </p>
<hr />
<div>Welcome to [http://www.algebra.com Algebra.Com]'s help pages. These pages are not for math help, they are for help with using features of this site such as defining lessons, solvers and so on.<br />
<br />
*[[Tutoring|Free Tutoring]] -- become famous and help children in need. Your answers will remain public forever!<br />
*[[Solvers| Our unique public '''Solver System''']]<br />
*[[Lessons| You can write '''lessons''', or even a whole algebra textbook]], to be seen by thousands<br />
*[[Feature Requests|Ask for a new feature here!]]<br />
*[[Plotting Formulas|Help with '''plotting formulas''']]<br />
*[[Simplifier|Help with the '''Universal Simplifier''']]</div>64.94.157.1https://wiki.algebra.com/index.php?title=Simplifier&diff=146Simplifier2005-07-08T17:34:40Z<p>64.94.157.1: </p>
<hr />
<div>[http://www.algebra.com Algebra.Com] has a Universal Simplifier with '''Work Shown'''. Even though it is a work in progress, my goal is to make it able to simplify any reasonable expression that a student might encounter, and to solve some equations. Eventually, it should be able to deal with formulas that use constants that are not expressible by finite sized decimal numbers, such as 1/3 or square root of 2. <br />
<br />
'''[[Simplifier-entering formulas|Click here if you are a student and need help with entering expressions to simplify and solve]]'''<br />
<br />
Here's the link to the simplifier: [http://www.algebra.com/services/rendering/simplifier.mpl http://www.algebra.com/services/rendering/simplifier.mpl].<br />
<br />
My simplifier is an outgrowth of the [[Plotting Formulas|formula plotting system]]. I want it to work better than any other competing web simplifier that shows work.<br />
<br />
This list may be not quite up to date, but the simplifier does the following, as of now:<br />
<br />
* Reduce all constant expressions to single constants<br />
* Removes extraneous 1's in terms and zeros in expressions<br />
* Reduces similar terms and factors<br />
* Opens up extraneous parentheses, being mindful of signs<br />
<br />
'''Future plans''' include:<br />
<br />
* Associative property<br />
* Factorization of polynomials and polynomial division<br />
* Solving equations<br />
<br />
Simplifier can be used in very many ways as a teaching tool. One way is to generate [[Formula plotting-simplifier cartoons|simplification cartoons]] to illustrate formula simplification, in solutions and lessons.</div>64.94.157.1https://wiki.algebra.com/index.php?title=Formula_plotting-simplifier_cartoons&diff=151Formula plotting-simplifier cartoons2005-07-08T17:34:05Z<p>64.94.157.1: </p>
<hr />
<div><TABLE><TR><TD>{{Formula}}</TD><TD>{{Simplifier}}</TD></TR></TABLE><br />
<br />
If you write a solution or a lesson, and want to explain to a student how to simplify something, give my a chance. My [[Simplifier|simplifier]] would try to simplify a formula and draw a very visual cartoon explaining simplification step by step. [http://www.algebra.com/services/rendering/simplifier.mpl Click here to practice with my expression simplifier].<br />
<br />
All you have to do is say:<br />
<br />
{{{simplifier_cartoon( x^2-x*x/2 ) }}}<br />
<br />
My server would draw a cartoon explaining simplification visually.<br />
<br />
The simplifier does the following:<br />
<br />
* reduction of constant expressions<br />
* removal of unnecessary parentheses (being mindful of sign)<br />
* reduction of similar factors<br />
* reduction of similar terms<br />
* removal of powers of 0 and 1<br />
<br />
I am working on expanding it and am open to suggestions. Feel free to click on the "Discussion" link on top of the page and add your request for a new simplification method. Add an example. Click [http://www.algebra.com/services/rendering/simplifier.mpl here to play with my expression simplifier].</div>64.94.157.1https://wiki.algebra.com/index.php?title=Formula_plotting-simplifier_cartoons&diff=144Formula plotting-simplifier cartoons2005-07-08T17:33:09Z<p>64.94.157.1: </p>
<hr />
<div><TABLE><TR><TD>{{Formula}}</TD><TD>{{Simplifier}}</TD></TR></TABLE><br />
<br />
If you write a solution or a lesson, and want to explain to a student how to simplify something, give my [http://www.algebra.com/services/rendering/simplifier.mpl expression simplifier] a chance. My simplifier would try to simplify a formula and draw a very visual cartoon explaining simplification step by step.<br />
<br />
All you have to do is say:<br />
<br />
{{{simplifier_cartoon( x^2-x*x/2 ) }}}<br />
<br />
My server would draw a cartoon explaining simplification visually.<br />
<br />
The simplifier does the following:<br />
<br />
* reduction of constant expressions<br />
* removal of unnecessary parentheses (being mindful of sign)<br />
* reduction of similar factors<br />
* reduction of similar terms<br />
* removal of powers of 0 and 1<br />
<br />
I am working on expanding it and am open to suggestions. Feel free to click on the "Discussion" link on top of the page and add your request for a new simplification method. Add an example. Click [http://www.algebra.com/services/rendering/simplifier.mpl here to play with my expression simplifier].</div>64.94.157.1https://wiki.algebra.com/index.php?title=Template:Simplifier&diff=302Template:Simplifier2005-07-08T17:31:31Z<p>64.94.157.1: </p>
<hr />
<div><div class="boilerplate metadata" id="cleanup" style="text-align: center; background: #dfefff; margin: .5em 10%; padding: .3em 1em; border: #9F9FFF 1px solid;"><br />
This page discusses [http://www.algebra.com/ Algebra.com]'s [[Simplifier]]. It simplifies expressions and will soon solve equations and do substitutions. Go to the '''[[Simplifier|formula simplifier portal]]''' for information on this extremely powerful tool. You can also see [http://www.algebra.com/services/rendering/simplifier.mpl many use examples and live practice with the simplifier]. It can also be used in tutors to quickly explain simplification and evaluation in cartoon form.<br />
</DIV><br />
----</div>64.94.157.1https://wiki.algebra.com/index.php?title=Simplifier-entering_formulas&diff=152Simplifier-entering formulas2005-07-08T17:30:28Z<p>64.94.157.1: </p>
<hr />
<div><TABLE><TR><TD>{{Simplifier}}</TD><TD>{{Formula}}</TR></TABLE><br />
<br />
==Entering formulas for simplifier==<br />
<br />
The formulas that my [[Simplifier|simplifier]] simplifies, are entered the same way as in my [[Plotting Formulas|formula plotting system]]. However, to simplify a formula, it needs to be understood much more deeply than when we just want to draw it as a picture. Therefore, there are some important '''requirements'''.<br />
<br />
==Requirements==<br />
*DO use multiplication sign '*' (the STAR) symbol. For the simplifier, xy is NOT the same as x*y or yx. Simplifier thinks that xy is a separate variable. '''Good example:''' x*y-y*(x+2). '''Bad example''': xy-y(x+2). <br />
*DO use '*' when multiplying a variable by an expression in parentheses: x*(x+2). Otherwise, my simplifier will think that you are trying to use a function and will become confused.<br />
*Use parentheses liberally to avoid any ambiguity. (x+y)/(x-y) is NOT the same as x+y/x-y. x+y/x-y means x+(y/x)-y.<br />
<br />
==Operations==<br />
<br />
*Use '*' (STAR) for multiplication. 2*3 is legal, 2x3 will be misunderstood.<br />
*Use '^' (CARET) for power. 2^3 means 2 to degree of 3, or 8. <br />
*Use '/' (FORWARD SLASH) for division<br />
*Only '(' and ')' (parentheses) are allowed for grouping terms. Curly or square brackets are used for other purposes.<br />
<br />
Operation priority: + and - have lowest priority, * and / h<br />
==Good Examples==<br />
<br />
x*y-x*(y+2) <-- '*' is used for multiplications<br />
a^b*3 <-- means (a to the degree of b) multiplied by 3<br />
<br />
==Bad examples==<br />
xy-yx <-- variable xy and variable yx are different variables<br />
y(x-2) <-- simplifier will think that it is function y of x-2.</div>64.94.157.1https://wiki.algebra.com/index.php?title=Simplifier-entering_formulas&diff=141Simplifier-entering formulas2005-07-08T17:26:34Z<p>64.94.157.1: </p>
<hr />
<div>{{Simplifier}}{{Formula}}<br />
<br />
==Entering formulas for simplifier==<br />
<br />
The formulas that my [[Simplifier|simplifier]] simplifies, are entered the same way as in my [[Plotting Formulas|formula plotting system]]. However, to simplify a formula, it needs to be understood much more deeply than when we just want to draw it as a picture. Therefore, there are some important '''requirements'''.<br />
<br />
==Requirements==<br />
*DO use multiplication sign '*' (the STAR) symbol. For the simplifier, xy is NOT the same as x*y or yx. Simplifier thinks that xy is a separate variable. '''Good example:''' x*y-y*(x+2). '''Bad example''': xy-y(x+2). <br />
*DO use '*' when multiplying a variable by an expression in parentheses: x*(x+2). Otherwise, my simplifier will think that you are trying to use a function and will become confused.<br />
*Use parentheses liberally to avoid any ambiguity. (x+y)/(x-y) is NOT the same as x+y/x-y. x+y/x-y means x+(y/x)-y.<br />
<br />
==Operations==<br />
<br />
*Use '*' (STAR) for multiplication. 2*3 is legal, 2x3 will be misunderstood.<br />
*Use '^' (CARET) for power. 2^3 means 2 to degree of 3, or 8. <br />
*Use '/' (FORWARD SLASH) for division<br />
*Only '(' and ')' (parentheses) are allowed for grouping terms. Curly or square brackets are used for other purposes.<br />
<br />
Operation priority: + and - have lowest priority, * and / h<br />
==Good Examples==<br />
<br />
x*y-x*(y+2) <-- '*' is used for multiplications<br />
a^b*3 <-- means (a to the degree of b) multiplied by 3<br />
<br />
==Bad examples==<br />
xy-yx <-- variable xy and variable yx are different variables<br />
y(x-2) <-- simplifier will think that it is function y of x-2.</div>64.94.157.1https://wiki.algebra.com/index.php?title=Template:Simplifier&diff=142Template:Simplifier2005-07-08T17:26:05Z<p>64.94.157.1: </p>
<hr />
<div><div class="boilerplate metadata" id="cleanup" style="text-align: center; background: #dfefff; margin: .5em 10%; padding: .3em 1em; border: #9F9FFF 1px solid;"><br />
This page discusses [http://www.algebra.com/ Algebra.com]'s [[Simplifier]]. It simplifies expressions and will soon solve equations and do substitutions. Go to the '''[[Simplifier|formula simplifier]]''' for information on this extremely powerful tool. You can also see [http://www.algebra.com/services/rendering/simplifier.mpl many use examples and live practice with the simplifier]. It can also be used in tutors to quickly explain simplification and evaluation in cartoon form.<br />
</DIV><br />
----</div>64.94.157.1https://wiki.algebra.com/index.php?title=Simplifier-entering_formulas&diff=140Simplifier-entering formulas2005-07-08T17:22:46Z<p>64.94.157.1: </p>
<hr />
<div>{{Formula}}<br />
<br />
==Entering formulas for simplifier==<br />
<br />
The formulas that my [[Simplifier|simplifier]] simplifies, are entered the same way as in my [[Plotting Formulas|formula plotting system]]. However, to simplify a formula, it needs to be understood much more deeply than when we just want to draw it as a picture. Therefore, there are some important '''requirements'''.<br />
<br />
==Requirements==<br />
*DO use multiplication sign '*' (the STAR) symbol. For the simplifier, xy is NOT the same as x*y or yx. Simplifier thinks that xy is a separate variable. '''Good example:''' x*y-y*(x+2). '''Bad example''': xy-y(x+2). <br />
*DO use '*' when multiplying a variable by an expression in parentheses: x*(x+2). Otherwise, my simplifier will think that you are trying to use a function and will become confused.<br />
*Use parentheses liberally to avoid any ambiguity. (x+y)/(x-y) is NOT the same as x+y/x-y. x+y/x-y means x+(y/x)-y.<br />
<br />
==Operations==<br />
<br />
*Use '*' (STAR) for multiplication. 2*3 is legal, 2x3 will be misunderstood.<br />
*Use '^' (CARET) for power. 2^3 means 2 to degree of 3, or 8. <br />
*Use '/' (FORWARD SLASH) for division<br />
*Only '(' and ')' (parentheses) are allowed for grouping terms. Curly or square brackets are used for other purposes.<br />
<br />
Operation priority: + and - have lowest priority, * and / h<br />
==Good Examples==<br />
<br />
x*y-x*(y+2) <-- '*' is used for multiplications<br />
a^b*3 <-- means (a to the degree of b) multiplied by 3<br />
<br />
==Bad examples==<br />
xy-yx <-- variable xy and variable yx are different variables<br />
y(x-2) <-- simplifier will think that it is function y of x-2.</div>64.94.157.1