My favorite theorem is the fundamental theorem of MA 453. It states that no matter what one posts on Rhea, one will receive credit.
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I really don't have anything to contribute elsewhere, so I guess I will expand this page for my credit this week.
For a serious note, I like Fermat's Little Theorem. It states, If p is a prime number and a is a natural number that is not a multiple of p then a^(p-1) ≡ 1 (mod p). I learned this in my cryptography class last semester and it was really handy. I also like how it is his "little" theorem.
--Aschuett 22:52, 5 February 2009 (UTC)