I am also having trouble proving this statement:

Let R be a commutative ring which is not a domain. Then R has no units other that 1 and -1. Is this true or is Zp a counterexample.

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- March 5th 2007, 12:36 PMchadlyterRing
I am also having trouble proving this statement:

Let R be a commutative ring which is not a domain. Then R has no units other that 1 and -1. Is this true or is Zp a counterexample. - March 5th 2007, 04:57 PMThePerfectHacker