$R$ is a sets of positive integers that $((a,b),(c,d))\in R \leftrightarrow a.c=b.d$
Prove that $R$ is an equivalence relation.
$R$ is a sets of positive integers that $((a,b),(c,d))\in R \leftrightarrow a.c=b.d$
Prove that $R$ is an equivalence relation.
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