“ More Deterministic ” vs . “ Smaller ” Büchi Automata

The standard technique for LTL model checking (M φ) consists on translating the negation of the LTL specification, φ, into a Büchi automaton Aφ, and then on checking if the product M Aφ has an empty language. The efforts to maximize the efficiency of this process have so far concentrated on developing translation algorithms producing Büchi automata which are “as small as possible”, under the implicit conjecture that this fact should make the final product smaller. In this paper we build on a different conjecture and present an alternative approach in which we generate instead Büchi automata which are “as deterministic as possible”, in the sense that we try to reduce as much as we are able to the presence of non-deterministic decision states in Aφ. We motivate our choice and present some empirical tests to support this approach.