Wolfram|Alpha is a "computational knowledge engine" developed by Wolfram Research, announced in March of 2009. It is unique in that in answers queries with direct computational results, rather than bringing up a page of documents and various webpages as most search engines do.
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WolframAlpha - Is it possible to associate equations with theorems?
Suppose I wanted to find out about the Pythagorean Theorem by searching via WolframAlpha. This is trivial -- we can search directly for Pythagorean Theorem and get a wealth of information.
But ...
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Plot multiple functions in Wolfram Alpha
I tried to multiple plot in WolframAlpha using this command from the Forum:
plot {1<=x<=2 1<y<3} and plot {x=4 1<y<3} and plot {1<=x<=2 y=4} and plot {x=4 y=4} and plot ...
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Wolfram|alpha comparing country sizes
By inputting
Portugal shape area, China shape area
to Wolfram|alpha I can get two country shapes, but how can I get them on top of each other at the same scale? The output I'm looking for is ...
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How are the lines on HTML element hierarchy plots in Wolfram|Alpha generated?
Wolfram Alpha provides HTML element hierarchy plots for web sites.
For an example, enter a popular website, like stackoverflow.com into the field:
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