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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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parser parser generator parsing Parsley Partial Differential Equation LANguage	equivalence relation PER	partial evaluation partial function partial key partially ordered set partial ordering