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Bouts d'un groupe opérant sur la droite, I : théorie algébrique

Gaël-Nicolas Meigniez (1990)

Annales de l'institut Fourier

On étudie les morphismes d’un groupe infini discret Π dans un groupe de Lie G contenu dans le groupe des difféomorphismes de la droite réelle. À un tel morphisme H , on associe deux ensembles de “bouts” de Π “dans la direction” H . On calcule le nombre de bouts dans plusieurs situations. Dans le cas particulier où Π est de type fini et où G est le groupe des translations, Π n’a qu’un bout dans la direction H si, et seulement si, ils vérifient la propriété de Bieri-Neumann-Strebel.

B-pologrupy

Juraj Bosák (1961)

Matematicko-fyzikálny časopis

Braided coproduct, antipode and adjoint action for U q ( s l 2 )

Pavle Pandžić, Petr Somberg (2024)

Archivum Mathematicum

Motivated by our attempts to construct an analogue of the Dirac operator in the setting of U q ( 𝔰𝔩 n ) , we write down explicitly the braided coproduct, antipode, and adjoint action for quantum algebra U q ( 𝔰𝔩 2 ) . The braided adjoint action is seen to coincide with the ordinary quantum adjoint action, which also follows from the general results of S. Majid.

Braids in Pau – An Introduction

Enrique Artal Bartolo, Vincent Florens (2011)

Annales mathématiques Blaise Pascal

In this work, we describe the historic links between the study of 3 -dimensional manifolds (specially knot theory) and the study of the topology of complex plane curves with a particular attention to the role of braid groups and Alexander-like invariants (torsions, different instances of Alexander polynomials). We finish with detailed computations in an example.

Brauer relations in finite groups

Alex Bartel, Tim Dokchitser (2015)

Journal of the European Mathematical Society

If G is a non-cyclic finite group, non-isomorphic G -sets X , Y may give rise to isomorphic permutation representations [ X ] [ Y ] . Equivalently, the map from the Burnside ring to the rational representation ring of G has a kernel. Its elements are called Brauer relations, and the purpose of this paper is to classify them in all finite groups, extending the Tornehave–Bouc classification in the case of p -groups.

Bruhat-Tits theory from Berkovich’s point of view. I. Realizations and compactifications of buildings

Bertrand Rémy, Amaury Thuillier, Annette Werner (2010)

Annales scientifiques de l'École Normale Supérieure

We investigate Bruhat-Tits buildings and their compactifications by means of Berkovich analytic geometry over complete non-Archimedean fields. For every reductive group G over a suitable non-Archimedean field k we define a map from the Bruhat-Tits building ( G , k ) to the Berkovich analytic space G an associated with G . Composing this map with the projection of G an to its flag varieties, we define a family of compactifications of ( G , k ) . This generalizes results by Berkovich in the case of split groups. Moreover,...

Brunnian links

Paul Gartside, Sina Greenwood (2007)

Fundamenta Mathematicae

A Brunnian link is a set of n linked loops such that every proper sublink is trivial. Simple Brunnian links have a natural algebraic representation. This is used to determine the form, length and number of minimal simple Brunnian links. Braids are used to investigate when two algebraic words represent equivalent simple Brunnian links that differ only in the arrangement of the component loops.

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