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A Type Soundness Proof for Variables in LCF ML

By Dennis Volpano and Geoffrey Smith


We prove the soundness of a polymorphic type system for a language with variables, assignments, and rst-class functions. As a corollary, this proves the soundness of the Edinburgh LCF ML rules for typing variables and assignments, thereby settling a long-standing open problem

Topics: Type theory, formal semantics, variables and assignment
Year: 1995
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