Partial equivalence relation
(PER) A relation R on a set S where R is symmetric (x R y => y R x) and transitive (x R y R z => x R z) and where there may exist elements in S for which the relation is not defined.
A PER is an equivalence relation on the subset for which it is defined, i.e. it is also refle
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Partial Differential Equation LANguage
partially ordered set