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I’m having a hard time proving a•b=a+b-2 on the set of integers is a group.

I’m having a hard time proving a•b=a+b-2 on the set of integers is a group.

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Z be the fet of integers For a, bez . a-b= a+b-2. fet a, b, 6€ Z closure Law A, bez =) atb-qEZ è = a.bE L (22) Associative L

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