Question: (2) The relation ~ on Z defined by x ~ y if and only if (-1) * = (-1)y is an equivalence relation. What are

(2) The relation ~ on Z defined by x ~ y

if and only if (-1) * = (-1)y is an equivalence relation.

(2) The relation ~ on Z defined by x ~ y if and only if (-1) * = (-1)y is an equivalence relation. What are its equivalence classes

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