For reflexive, symmetric and transitive relations. Use it with the tag (relations).
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Proving if a relation is an equivalence relationIs $f:\mathbb{Z}_{30}\longrightarrow\mathbb{Z}_{30}$ defined by $f([a])=[7a]$ well defined?
$x,y$ related if and only if $x\cap\{{1,3,5\}}=y\cap\{{1,3,5\}}$.
Equivalence relations on classes instead of sets
Equivalence relations on classes instead of sets
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