Recursive models have been used in the past to model the variation of number of processes in all the queuing systems of heterogeneous parallel computer system. The main reasons for the use of recursive models when modeling the variation of number of processes in all the queuing systems of a heterogeneous parallel computer system is the inability of the analytic technique to determine the exact ...

We present a proof technique, based on syntactic logical relations, for showing contextual equivalence of expressions in a λ-calculus with recursive types and impredicative universal and existential types. We show that for recursive and polymorphic types, the method is both sound and complete with respect to contextual equivalence, while for existential types, it is sound but incomplete. Our de...