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Resultados globales: 16 registros encontrados en 0.01 segundos.
Documentos de investigación, Encontrados 16 registros

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17 p, 202.1 KB

Restricted walks in regular trees / Ciobanu, Laura ; Radomirovic, S. ; Centre de Recerca Matemàtica
Let T be the Cayley graph of a finitely generated free group F. Given two vertices in T consider all the walks of a given length between these vertices that at a certain time must follow a number of predetermined steps. [...]
Centre de Recerca Matemàtica 2006 (Prepublicacions del Centre de Recerca Matemàtica ; 687)

13 p, 203.5 KB

Shellability of noncrossing partition lattices / Athanasiadis, Christos A. ; Brady, Thomas ; Watt, Colum ; Centre de Recerca Matemàtica
We give a case-free proof that the lattice of noncrossing partitions associated to any finite real reflection group is EL-shellable. Shellability of these lattices was open for the groups of type Dn and those of exceptional type and rank at least three.
Centre de Recerca Matemàtica 2005 (Prepublicacions del Centre de Recerca Matemàtica ; 619)

25 p, 276.9 KB

Cat(0) and Cat (-1) dimensions of torsion free / Brady, Noel ; Crisp, John ; Centre de Recerca Matemàtica
We show that a particular free-by-cyclic group has CAT(0) dimension equal to 2, but CAT(-1) dimension equal to 3. We also classify the minimal proper 2-dimensional CAT(0) actions of this group; they correspond, up to scaling, to a 1-parameter family of locally CAT(0) piecewise Euclidean metrics on a fixed presentation complex for the group. [...]
Centre de Recerca Matemàtica 2005 (Prepublicacions del Centre de Recerca Matemàtica ; 616)

10 p, 169.6 KB

26 p, 244.3 KB

20 p, 285.4 KB

24 p, 306.2 KB

Free and fragmenting filling length / Bridson, Martin, R. ; Riley, Tim ; Centre de Recerca Matemàtica
The filling length of an edge-circuit η in the Cayley 2-complex of a finite presentation of a group is the minimal integer length L such that there is a combinatorial null-homotopy of η down to a base point through loops of length at most L. [...]
Centre de Recerca Matemàtica 2005 (Prepublicacions del Centre de Recerca Matemàtica ; 660)

33 p, 301.9 KB

10 p, 165.6 KB

A proof that all Seifert 3-manifold groups and all virtual surface groups are conjugacy separable / Martino, Armando ; Centre de Recerca Matemàtica
We prove that the fundamental group of any Seifert 3-manifold is conjugacy separable. That is, conjugates may be distinguished infinite quotients or, equivalently, conjugacy classes are closed in the pro-finite topology.
Centre de Recerca Matemàtica 2005 (Prepublicacions del Centre de Recerca Matemàtica ; 627)

10.

25 p, 228.7 KB

Combinatorial and metric properties of Thompson's group T / Burillo Puig, Josep ; Cleary, Sean ; Stein, Melanie ; Taback, Jennifer ; Centre de Recerca Matemàtica
We discuss metric and combinatorial properties of Thompson's group T, such as the normal forms for elements and uniqueness of tree pair diagrams. We relate these properties to those of Thompson's group F when possible, and highlight combinatorial differences between the two groups. [...]
Centre de Recerca Matemàtica 2005 (Prepublicacions del Centre de Recerca Matemàtica ; 621)

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