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|It's like asking why Beethoven's Ninth Symphony is beautiful. If you don't see why, someone can't tell you. I know numbers are beautiful. If they aren't beautiful, nothing is. - Paul Erdős|
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The math code works just like TeX. I suggest looking up symbols and functions in other problems and seeing how it's done there.
Here's a good list of symbols: http://meta.wikimedia.org/wiki/Help:Formula
Here is a bunch of TeX documentation:
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