Unformatted text preview: n (1) and ab = ( ab )mod n, (2) where the addition and multiplication on the right sides are the usual operations in Z . Prove Z 5 is a ﬁeld and prove Z 4 is not. 1...
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 Fall '06
 Taft
 Linear Algebra, Algebra, Prime number, Z4, Z. Prove Z5

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