## logical relation

A relation R satisfying

f R g <=> For all a, b, a R b => f a R g b

This definition, by Plotkin, can be used to extend the definition of a relation on the types of a and b to a relation on functions.

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A relation R satisfying

f R g <=> For all a, b, a R b => f a R g b

This definition, by Plotkin, can be used to extend the definition of a relation on the types of a and b to a relation on functions.

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