About noncommuting graphs.
About presentations of braid groups and their generalizations
In the paper we give a survey of rather new notions and results which generalize classical ones in the theory of braids. Among such notions are various inverse monoids of partial braids. We also observe presentations different from standard Artin presentation for generalizations of braids. Namely, we consider presentations with small number of generators, Sergiescu graph-presentations and Birman-Ko-Lee presentation. The work of V.~V.~Chaynikov on the word and conjugacy problems for the singular...
About the finite groups whose minimal normal subgroups are union of two conjugacy classes exactly
About the finiteness of monoids generated by closures and interiors.
About the heart of a hypergroup
Absolute flatness of regular semigroups with a finite height function.
Absolute irreducibility for finitary linear groups
Absolute stable rank and Witt cancellation for noncommutative rings.
Abstract homomorphisms of simple algebraic groups
Abundant semigroups whose idempotents satisfy permutation identities.
Abundant semigroups with a medical idempotent.
Abundant semigroups with a multiplicative type A transversal.
Action groupoid in protomodular categories.
Action of topological semigroups, invariant means, and fixed points
Actions and automorphisms of crossed modules
Actions de groupes sur les arbres
Actions of a noncompact semigroup with zero.
Actions of discrete groups on nonpositively curved spaces.
Actions of finite groups on C*-algebras.
Actions of finitely generated groups on -trees
We study actions of finitely generated groups on -trees under some stability hypotheses. We prove that either the group splits over some controlled subgroup (fixing an arc in particular), or the action can be obtained by gluing together actions of simple types: actions on simplicial trees, actions on lines, and actions coming from measured foliations on -orbifolds. This extends results by Sela and Rips-Sela. However, their results are misstated, and we give a counterexample to their statements.The...