Reachability Programming in HOL98 Using BDDs

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Two methods of programming BDD-based symbolic algorithms in the Hol98 proof assistant are presented. The goal is to provide a platform for implementing intimate combinations of deduction and algorithmic verification, like model checking. The first programming method uses a small kernel of ML functions to convert between BDDs, terms and theorems. It is easy to use and is suitable for rapid prototying experiments. The second method requires lower-level programming but can support more efficient calculations. It is based on an LCF-like use of an abstract type to encapsulate rules for manipulating judgements ρ tb meaning “logical term t is represented by BDD b with respect to variable order ρ”. The two methods are illustrated by showing how to perform the standard fixed-point calculation of the BDD of the set of reachable states of a finite state machine.