The purpose of this paper is to divide the monoid of languages M into a partition and study some combinatorial properties of each cell in the partition. We investigate some properties of delta-languages and in particu...
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The purpose of this paper is to divide the monoid of languages M into a partition and study some combinatorial properties of each cell in the partition. We investigate some properties of delta-languages and in particular, we give a characterization of two-element delta-codes. We also consider the properties of the regular gamma-languages (xy)* x for any x, y is an element of X *.
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