K. Sangkhanan

activity

20172024

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3 papers · 1 filter

math.RA2024

Transformation Semigroups Which Are Disjoint Union of Symmetric Groups

Utsithon Chaichompoo, Kritsada Sangkhanan

Let $X$ be a nonempty set and $T (X)$ the full transformation semigroup on $X$ . For any equivalence relation $E$ on $X$ , define a subsemigroup $T_{E^{*}} (X)$ of $T (X)$ by $$ T_{E^*}(X…

math.RA2024

Semigroups of linear transformations whose restrictions belong to a general linear group

Kritsada Sangkhanan

Let $V$ be a vector space and $U$ a fixed subspace of $V$ . We denote the semigroup of all linear transformations on $V$ under composition of functions by $L (V)$ . In this paper, we…

math.RA2023

The regular part of transformation semigroups that preserve double direction equivalence relation

Kritsada Sangkhanan

Let $T (X)$ be the full transformation semigroup on a set $X$ under the composition of functions. For any equivalence relation $E$ on $X$ , define a subsemigroup $T_{E^{*}} (X)$ of $T(X…