If I have a subset, how do I define an equivalence relation.(adsbygoogle = window.adsbygoogle || []).push({});

I understand it has to satisfy three properties:transitive, symmetric and reflexive, but I'm not sure how to give an explicit definition of the equivalence relation, for example on I where

[itex]I=\{(x,y) : 0 \le x\le 1 \ \& \ 0 \le y \le 1\}[/itex]

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# Define an equivalence relation

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