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by jgrimes
5177 days ago
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There is a field of size 256, but it isn't Z/256Z. "Even though all fields of size p are isomorphic to Z/pZ, for n ≥ 2 the ring Z/(p^n)Z (the ring of integers modulo p^n) is not a field. The element p (mod p^n) is nonzero and has no multiplicative inverse." |
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