On algebraic closure and amalgamation of semigroups.
On algebraic tori of norm type.
On algebraically compact semigroup rings.
On Algebras all of Whose Subalgebras are Simple; Some Solutions of Plonka's Problem
On almost finitely generated nilpotent groups.
On almost normal subgroups of supersoluble groups
Un sottogruppo di un gruppo si dice «almost normal» se ha soltanto un numero finito di coniugati in , e ovviamente l'insieme costituito dai sottogruppi almost normal di è un sottoreticolo del reticolo di tutti i sottogruppi di . In questo articolo vengono studiati gli isomorfismi tra reticoli di sottogruppi almost normal, provando in particolare che se è un gruppo supersolubile e è un gruppo FC-risolubile tale che i reticoli e sono isomorfi, allora anche è supersolubile, e...
On almost semigroups
On Alperin's fusion theorem.
On Amalgamated Products of Profinite Groups.
On an algorithm to decide whether a free group is a free factor of another
We revisit the problem of deciding whether a finitely generated subgroup is a free factor of a given free group . Known algorithms solve this problem in time polynomial in the sum of the lengths of the generators of and exponential in the rank of . We show that the latter dependency can be made exponential in the rank difference rank - rank, which often makes a significant change.
On an algorithm to decide whether a free group is a free factor of another
We revisit the problem of deciding whether a finitely generated subgroup H is a free factor of a given free group F. Known algorithms solve this problem in time polynomial in the sum of the lengths of the generators of H and exponential in the rank of F. We show that the latter dependency can be made exponential in the rank difference rank(F) - rank(H), which often makes a significant change.
On an application of the work of D.E. Knuth to semigroups.
On an equivalence of fuzzy subgroups. III.
On an open problem of Green and Losonczy: exact enumeration of freely braided permutations.
On another two cryptographic identities in universal Osborn loops.
On anticommutative semirings.
On anti-inverse semigroups.
On approximation of amenable groups by finite quasigroups.
On arithmetic Fuchsian groups and their characterizations
This is a small survey paper about connections between the arithmetic and geometric properties in the case of arithmetic Fuchsian groups.
On aspherical presentations of groups.