Issue No. 12 - December (1973 vol. 22)

ISSN: 0018-9340

pp: 1099-1102

C.P. Pfleeger , Department of Computer Science, Pennsylvania State University

ABSTRACT

The problem of reducing the number of states in an arbitrary incompletely specified deterministic finite-state machine to k states (for a given k) has proven intractible to solution within "reasonable" time; most techniques seem to require exponential time. Two reduction techniques?state assignment to the DON'T CARE entries, and so-called "state splitting"?are investigated. For both of the techniques, the question, "Can I achieve an equivalent k state machine?" is shown to be polynomial complete, with the resulting conjecture that neither is solvable in time bounded by a polynomial function of the size of the machine.

INDEX TERMS

DoN'r CARE conditions, fmite automaton, incompletely specified finite-state machine, machine minimization, maximum compatibles, polynomial complete, polynomial reducible, state reduction, state splitting, sequential machine.

CITATION

C. Pfleeger, "State Reduction in Incompletely Specified Finite-State Machines," in

*IEEE Transactions on Computers*, vol. 22, no. , pp. 1099-1102, 1973.

doi:10.1109/T-C.1973.223655

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