The report FIMU-RS-99-02
Complexity Issues of the Pattern Equations in Idempotent Semigroups
by Ond°ej KlÝma, Ji°Ý Srba, August 1999, 14 pages.
FIMU-RS-99-02. Available as Postscript, PDF.
A pattern equation is a word equation of the form X=A where X is a sequence of variables and A is a sequence of constants. The problem whether X=A has a solution in a free idempotent semigroup (free band) is shown to be NP--complete.
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