[代數] 平方和
Prove that for all element z in a finite field E is a sum of two squares
(If z=a^2 is a square, then we may write z=a^2+0^2)
Hint: Let G be a finite group, and let S and T be two nonempty set.
Then, either G=ST or |G|≧|S|+|T|
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