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Let \( R \) be an equivalence relation on \( A \). Given \( a \in A \), define \( [a] \) to be the ...
Let \( R \) be an equivalence relation on \( A \). Given \( a \in A \), define \( [a] \) to be the set \[ [a]=\{b \in A \mid(a, b) \in R\} . \] Show that \( \{[a] \mid a \in A\} \) is a partition of \( A \).