Define the the relation R on the integers Z by xRy if and only if either x/y or y/x.

For each n E Z, define An to be the set of integers related to n. An={xEZ:xRn}

Proving the quality below

Intersection An= {-1,0,1}

So here my prove

An is a subset of {-1,0,1}, so if xEAn then XE{-1,0,1} ==> Intersection An is a subset of {-1,0,1}.

Suppose that m is not belong of {-1,0,1} then m is not belong to Intersection An ===> {-1,0,1} is a subset of Intersection An

I a little confusing , i know im missing something out there,

Any help or suggestions would be greatly appreciated. Thanks