SEMIGROUPS OF TRANSFORMATIONS WITH INVARIANT SET
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Let T(X) denote the semigroup (under composition) of trans-formations from X into itself. For a fixed nonempty subset Y of X, let S(X, Y) = <수식>Then S(X, Y) is a semigroup of total transformations of X which leave a subset Y of X invariant. In this paper, we characterize when S(X,Y)is isomorphic to T(Z) for some set Z and prove that every semigroup A can be embedded in S(A^1,A). Then we describe Green's relations for S(X,Y) and apply these results to obtain its group H-classes and ideals.
Abstract
Let T(X) denote the semigroup (under composition) of trans-formations from X into itself. For a fixed nonempty subset Y of X, let S(X, Y) = <수식>Then S(X, Y) is a semigroup of total transformations of X which leave a subset Y of X invariant. In this paper, we characterize when S(X,Y)is isomorphic to T(Z) for some set Z and prove that every semigroup A can be embedded in S(A^1,A). Then we describe Green's relations for S(X,Y) and apply these results to obtain its group H-classes and ideals.
참고문헌 (7)
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