Einige Bemerkungen zur Verzweigung des Punktes durch einen Komplex von Transformationen
Embedding in bisimple semigroups.
Embedding properties of endomorphism semigroups
Denote by PSelf Ω (resp., Self Ω) the partial (resp., full) transformation monoid over a set Ω, and by Sub V (resp., End V) the collection of all subspaces (resp., endomorphisms) of a vector space V. We prove various results that imply the following: (1) If card Ω ≥ 2, then Self Ω has a semigroup embedding into the dual of Self Γ iff . In particular, if Ω has at least two elements, then there exists no semigroup embedding from Self Ω into the dual of PSelf Ω. (2) If V is infinite-dimensional, then...
Embedding semigroups by translational hulls.
Embedding semigroups into semigroups with countability index two.
Embeddings in iteration groups and semigroups with nontrivial units.
Endomorphism monoids of bands.
Epimorphisms and dominions.
Epimorphisms of inverse semigroups of homeomorphisms between closed subsets.
Equivalences, a-semigroups and a-congruences.
Équivalences de Green dans les catégories bien filtrantes
Every group is a maximal subgroup of the semigroup of relations
Existence of joins and meets in the partially ordered family of CM-homomorphisms.
Extending partial isomorphisms and McAlister's covering theorem.