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Hua's identity
Formula relating pairs of elements in a division ring From Wikipedia, the free encyclopedia
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In algebra, Hua's identity[1] named after Hua Luogeng, states that for any elements a, b in a division ring, whenever . Replacing with gives another equivalent form of the identity:
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Hua's theorem
The identity is used in a proof of Hua's theorem,[2] which states that if is a function between division rings satisfying then is a homomorphism or an antihomomorphism. This theorem is connected to the fundamental theorem of projective geometry.
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Proof of the identity
One has
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References
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