Concerning a categorial approach to topological and algebraic theories
On extensions onto sub-semigroups of semigroups with two generators.
Relations (Graphs) with Given Finitely Generated Semigroups.
Relations (Graphs) with Given Infinite Semigroups.
Symmetric Relations (Undirected Graphs) with Given Semigroups.
On subsemigroups of transformation semigroups with two generators.
On determinacies of monoids.
A game of composing binary relations
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