For an integer n > 1, let G =Un, the group of units inZn; that is, the set of all [a] inZn that have multiplicative inverses. Prove thatUn is a group with respect to multiplication.

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- May 2nd 2010, 01:42 PMMissMouseyProve that Un is a group with respect to multiplication.
For an integer n > 1, let G =

**U**n, the group of units in**Z**n; that is, the set of all [a] in**Z**n that have multiplicative inverses. Prove that**U**n is a group with respect to multiplication. - May 2nd 2010, 08:47 PMDrexel28