As I have told some users, I am a mathematician, and that's probably where I will contribute the most. Since haven't even started graduate school yet (Spring '10), I will defer to other mathematicians on math stuff we put up.
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If you'd like an idea of my math abilities, see http://www.proofwiki.org/wiki/User:J_D_Bowen , my user page at ProofWiki*.
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*''For other mathematicians, I can't praise ProofWiki enough, and I encourage other math folks to head over and contribute!''