We examine, in a general setting, a notion of inverse semigroup of left quotients, which we call left I-quotients. This concept has appeared, and has been used, as far back as Clifford’s seminal work describing bisimple inverse monoids in terms of their right unit subsemigroups. As a consequence of our approach, we find a straightforward way of extending Clifford’s work to bisimple inverse semi...

Let n, k be positive integers, with k ≤ n, and let τ be a fixed permutation of {1, . . . , k}. We will call τ the pattern. We will look for the pattern τ in permutations σ of n letters. A pattern τ is said to occur in a permutation σ if there are integers 1 ≤ i1 < i2 < . . . < ik ≤ n such that for all 1 ≤ r < s ≤ k we have τ(r) < τ(s) if and only if σ(ir) < σ(is). Example: Suppose τ = (132). Th...

This article presents a biomechanical model of the right arm, developped with respect to the functional anatomy of the human. This model is developped as a motion analysis tool. The main application issued from this model is the muscle forces estimation of the flexion/extension and internal rotation of the forearm joints. This estimation is based on an inverse dynamics method, improved with add...

A visión de Xela Arias sobre a escrita reflectida en textos autopoéticos, conferencias ou entrevistas permite reconstrución dun discurso metaliterario que non só define as claves da súa poética senón sitúa nunhas coordenadas estéticas e ideolóxicas. Das primeiras destaca importancia linguaxe —a palabra— nun constante exercicio experimentación baseado na liberdade. segundas, conciencia estar esc...

Le synovialosarcome abdominal primitifestunetumeurmesenchymateuse rare, qui se presente sous formedune masse intra-abdominale de croissancelente, ayant un aspect heterogene avec des calcifications excentriques. Letudeanatomopathologique la biopsieou piece operatoirepermet confirmer le diagnostic. traitement referencecest chirurgie exerese large , Cependant, risque recidiveresteeleve, cest pour ...

Hematological disorders due to covid 19 infection are increasingly known hyperleukocytosis, lymphopenia and thrombocytopenia. However, the association between non-existent, non-apparent or asymptomatic acute leukemia remains rare. No causal relationship has been established leukemia. We report a case of young patient admitted for treatment severe viral pneumonitis in whom an was diagnosed.

Le syndrome dEagle est caracterise par lossification du ligament stylo- hyoidien ou un processus styloidien trop long. Cest une entite rare peu connue les cliniciens et radiologues ayant large presentation clinique a lorigine dun retard diagnostique. Nous rapportons le cas dune jeune patiente agee de 28 ans, sans antecedents pathologiques particuliers qui consulte pour des otalgies bilaterales ...