Abstract

Abstract The paper is concerned with word functions over the alphabet {1,2}. Given arbitrary one-place functions f 1, …, f l , the class BPC[f 1, …, f l ] is defined as the closure of the set of simplest word functions and the functions f 1, …, f l under the operations of superposition and bounded prefix concatenation. The class BPC[f 1, …, f l ] is shown to have a finite basis with respect to the superposition.

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