Definition:Equivalence Relation Induced by Mapping

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Definition

Let $f: S \to T$ be a mapping.


Let $\mathcal R_f \subseteq S \times S$ be the relation defined as:

$\tuple {s_1, s_2} \in \mathcal R_f \iff \map f {s_1} = \map f {s_2}$


Then $\mathcal R_f$ is known as the equivalence (relation) induced by $f$.


Also known as

The equivalence induced by $f$ is variously known as:

  • the (equivalence) relation (on $S$) induced by (the mapping) $f$
  • the (equivalence) relation (on $S$) defined by (the mapping) $f$
  • the (equivalence) relation (on $S$) associated with (the mapping) $f$
  • the equivalence kernel of $f$.


Also see


Sources