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Making Substitutions Explicit In Sasylf, Michael David Ariotti
Making Substitutions Explicit In Sasylf, Michael David Ariotti
Theses and Dissertations
SASyLF is an interactive proof assistant whose goal is to teach: about type systems,
language meta-theory, and writing proofs in general. This software tool stores user-specified
languages and logics in the dependently-typed LF, and its internal proof structure closely
resembles M2+ . This thesis describes a new usability feature of SASyLF, “where” clauses,
which make explicit previously hidden substitutions that arise through constructs in the proof
code, primarily case analyses. An overview of SASyLF and logical frameworks is given, with
motivating examples. The requirements for “where” clauses are discussed, including a formal
definition of correctness. The feature’s implementation in SASyLF …