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eiπ + 1 = 0
This beautiful equation combines
some of the most important numbers.
From Wolfram comes "Mathematica", a very famous and powerful software. Among the features are:
numeric and symbolic calculation, parallel computation, visualization, import and export possibilities, ...
The prize is accordingly, but they offer a student version (which can later be upgraded to the professional one).
Wolfram also has a premier service, which includes updates, online courses, ...
http://www.wolfram.com/
And of course for information you can also check Wikipedia .