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Question
Let I = `langle 3 rangle` = {0 , 3} ,
then `ZZ_6`/I = {0 + I , 1 + I , 2 + I} = {{0 , 3} , {1 , 4} , {2 , 5}}.
`ZZ_6`/I is an integral domain iff I is a prime ideal
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