Pattern Equations and Equations with Stuttering
نویسندگان
چکیده
Word equation in a special form X = A, where X is a sequence of variables and A is a sequence of constants, is considered. The problem whether X = A has a solution over a free monoid (PatternEquation problem) is shown to be NP–complete. It is also shown that disjunction of a special type equation systems and conjunction of the general ones can be eliminated. Finally, the case of stuttering equations where the word identity is read modulo x = x is mentioned.
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