Appendices
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 
to the set 
is a collection of ordered pairs 
. One often writes 
to show x is related to y.
to the set is a collection of ordered pairs . One often writes to show x is related to y.Definition 196 Equivalence Relation
An equivalence relation on a set is a subset ...
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