A Simple Model Checker

For a small finite state machine we can use a simple model checker for a state safety property:

Algorithm: `Find reachable state space' (add successors of current set until closure):

S can be held explicitly in bit map form or symbolically as a BDD.

Variation 1: ignore safety property while finding reachable state space then finally check for all found states.

Variation 2: property to check might be a path property, so either

• Compile it to a checking automaton (becomes a state property of expanded NSF), or
• Expand it as we go (using modal mu calculus).