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Unformatted text preview: r,s so that ra + sn = 1.] Exercise 80. For n N , n 2, let U ( n ) = { a Z n  gcd( a,n ) = 1 } . a. Use the result of the previous exercise to show that ( U ( n ) , n ) is a group. b. Determine whether or not U ( n ) is cyclic for n = 8 , 9 , 10 , 11 , 12....
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This note was uploaded on 02/29/2012 for the course MATH 3326 taught by Professor Ryandaileda during the Fall '09 term at Trinity University.
 Fall '09
 RyanDaileda
 Math

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