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M. Wahab, The Semantics of TLA on the PVS Theorem Prover (October 1, 1996).
An implementation of Lamport's Temporal Logic of Actions (TLA) on a higher order logic theorem prover is described. TLA is a temporal logic, for which a syntax and semantics are defined, based on an action logic which is represented by higher order functions. The temporal logic includes quantifiers for variables with constant values and for variables whose values change over time. The semantics of the latter depend on an auxiliary function which cannot be defined by primitive recursion and an alternative is given based on the Hilbert e operator.