4 documents found, page 1 of 1
Up-Mind: um programa de treino para otimização de competências de grupos de ope...
Mendes, Maria Luís; Patrão, Ana; Passos, Fernando; Silva, Jorge; Lucas, Paulo; Malheiro, António; Fonseca, Francisco; Pereira, AnabelaSendo a atividade policial uma profissão reconhecida como uma das mais stressantes e com exposição a eventos potencialmente traumáticos, é fundamental preparar os operacionais de modo a minimizar este impacto emocional que prejudica a saúde física e psicológica. Baseado nos princípios da gestão do stresse, psicologia do desporto e neuropsicologia, foi desenvolvido um programa de treino de competências de auto-r...
Conjugation in semigroups
Araújo, João; Konieczny, Janusz; Malheiro, AntónioThe action of any group on itself by conjugation and the corresponding conjugacy relation play an important role in group theory. There have been several attempts to extend the notion of conjugacy to semigroups. In this paper, we present a new definition of conjugacy that can be applied to an arbitrary semigroup and it does not reduce to the universal relation in semigroups with a zero. We compare the new notio...
A characterization of adequate semigroups by forbidden subsemigroups
Araújo, João; Kinyon, Michael; Malheiro, AntónioA semigroup is \emph{amiable} if there is exactly one idempotent in each R∗-class and in each L∗-class. A semigroup is \emph{adequate} if it is amiable and if its idempotents commute. We characterize adequate semigroups by showing that they are precisely those amiable semigroups which do not contain isomorphic copies of two particular nonadequate semigroups as subsemigroups.
On finite complete presentations and exact decompositions of semigroups
Araújo, João; Malheiro, AntónioWe prove that given a finite (zero) exact right decomposition (M, T) of a semigroup S, if M is defined by a finite complete presentation, then S is also defined by a finite complete presentation. Exact right decompositions are natural generalizations to semigroups of coset decompositions in groups. As a consequence, we deduce that any Zappa–Szép extension of a monoid defined by a finite complete presentation, b...