We give a method for proving congruence of bisimulation-like equivalences in functional programming languages. The method applies to languages that can be presented as a set of expressions together with an evaluation relation. We use this method to show that some generalizations of Abramsky's applicative bisimulation are congruences whenever evaluation can be speci ed by a certain natural form of structured operational semantics. One of the generalizations handles nondeterminism and diverging computations.
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