A.1. Review of General Mathematical Notions

Definition 194 Relation
A relation is any subset of a Cartesian product.
Definition 195 Binary Relation
A binary relation from the set B9780123846983000104/si1.gif is missing to the set B9780123846983000104/si2.gif is missing is a collection of ordered pairs B9780123846983000104/si3.gif is missing. One often writes B9780123846983000104/si4.gif is missing to show x is related to y.
Definition 196 Equivalence Relation
An equivalence relation on a set is a subset ...

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