Now showing items 377-396 of 1524

• #### The Becker-Gottlieb Transfer: a Geometric Description ﻿

[OWP-2019-13] (Mathematisches Forschungsinstitut Oberwolfach, 2019-05-14)
In this note, we examine geometric aspects of the Becker-Gottlieb transfer in terms of the Umkehr and index maps, and rework some classic index theorems, using the cohomological formulae of the Becker-Gottlieb transfer. ...
• #### The Berry-Keating Operator on a Lattice ﻿

[OWP-2016-23] (Mathematisches Forschungsinstitut Oberwolfach, 2016-11-17)
We construct and study a version of the Berry-Keating operator with a built-in truncation of the phase space, which we choose to be a two-dimensional torus. The operator is a Weyl quantisation of the classical Hamiltonian ...
• #### Billiards and flat surfaces ﻿

[SNAP-2015-001-EN] (Mathematisches Forschungsinstitut Oberwolfach, 2015)
[also available in German] Billiards, the study of a ball bouncing around on a table, is a rich area of current mathematical research. We discuss questions and results on billiards, and on the related topic of flat surfaces.
• #### 1119 - Billiards, Flat Surfaces, and Dynamics on Moduli Spaces ﻿

[OWR-2011-25] (2011) - (08 May - 14 May 2011)
This workshop brought together people working on the dynamics of various flows on moduli spaces, in particular the action of SL$_2(\mathbb R)$ on flat surfaces. The new results presented covered properties of interval ...
• #### Boundary Representations of Operator Spaces, and Compact Rectangular Matrix Convex Sets ﻿

[OWP-2016-24] (Mathematisches Forschungsinstitut Oberwolfach, 2016-12-13)
We initiate the study of matrix convexity for operator spaces. We define the notion of compact rectangular matrix convex set, and prove the natural analogs of the Krein-Milman and the bipolar theorems in this context. We ...
• #### Braid equivalences and the L-moves ﻿

[OWP-2011-20] (Mathematisches Forschungsinstitut Oberwolfach, 2011-05-19)
In this survey paper we present the L-moves between braids and how they can adapt and serve for establishing and proving braid equivalence theorems for various diagrammatic settings, such as for classical knots, for knots ...
• #### Bredon Cohomology and Robot Motion Planning ﻿

[OWP-2017-34] (Mathematisches Forschungsinstitut Oberwolfach, 2017-11-29)
In this paper we study the topological invariant ${\sf {TC}}(X)$ reflecting the complexity of algorithms for autonomous robot motion. Here, $X$ stands for the configuration space of a system and ${\sf {TC}}(X)$ is, roughly, ...
• #### 0420 - Buildings and Curvature ﻿

[OWR-2004-23] (2004) - (09 May - 15 May 2004)
It was the aim of the meeting to bring together international experts from the theory of buildings, differential geometry and geometric group theory. Buildings are combinatorial structures (simplicial complexes) which can ...
• #### 0804 - Buildings: Interactions with Algebra and Geometry ﻿

[OWR-2008-3] (2008) - (20 Jan - 26 Jan 2008)
The focus of the conference was on buildings and their applications. Buildings are combinatorial structures (metric cell complexes) which may be viewed as simultaneous generalizations of trees and projective spaces. There ...
• #### 0834 - C*-Algebras ﻿

[OWR-2008-37] (2008) - (17 Aug - 23 Aug 2008)
A C*-algebra is an involutive Banach algebra $A$ which satisfies the C*-condition $\|a^*a\|=\|a\|^2$ for all $a\in A$. The theory of C*-algebras goes back to work of Murray and von Neumann, who first studied a special ...
• #### 1634 - C*-Algebras ﻿

[OWR-2016-40] (2016) - (21 Aug - 27 Aug 2016)
The field of operator algebras is a flourishing area of mathematics with strong ties to many other areas including functional/harmonic analysis, topology, (non-commutative) geometry, group theory and dynamical systems. The ...
• #### 1244 - C*-Algebras, Dynamics, and Classification ﻿

[OWR-2012-52] (2012) - (28 Oct - 03 Nov 2012)
Classification is a central theme in mathematics, and a particularly rich one in the theory of operator algebras. Indeed, one of the first major results in the theory is Murray and von Neumann’s type classification of ...
• #### 0535 - C*-Algebren ﻿

[OWR-2005-41] (2005) - (28 Aug - 03 Sep 2005)
The aim of the workshop C ∗ -algebras was to bring together researchers from basi- cally all areas related to operator algebra theory. This gives a unique opportunity to obtain a broader view of the subject and to create ...
• #### 1335 - C*-Algebren ﻿

[OWR-2013-43] (2013) - (25 Aug - 31 Aug 2013)
C*-algebras play an important role in many modern areas of mathematics, like Noncommutative Geometry and Topology, Dynamical Systems, Harmonic Analysis and others. The conference “C*-algebras” brings together leading experts ...
• #### 1010 - C*-Algebren ﻿

[OWR-2010-13] (2010) - (07 Mar - 13 Mar 2010)
The theory of C*-algebras plays a major role in many areas of modern mathematics, like Non-commutative Geometry, Dynamical Systems, Harmonic Analysis, and Topology, to name a few. The aim of the conference “C*-algebras” ...
• #### Calculating conjugacy classes in Sylow p-subgroups of finite Chevalley groups of rank six and seven ﻿

[OWP-2013-10] (Mathematisches Forschungsinstitut Oberwolfach, 2013-04-10)
Let $G(q)$ be a finite Chevalley group, where $q$ is a power of a good prime $p$, and let $U(q)$ be a Sylow $p$-subgroup of $G(q)$. Then a generalized version of a conjecture of Higman asserts that the number $k(U(q))$ of ...
• #### 0628 - Calculus of Variations ﻿

[OWR-2006-31] (2006) - (09 Jul - 15 Jul 2006)
The workshop Calculus of Variations'' took place from July 9 to 15, 2006, and was attended by almost fifty participants, mostly from European and North American universities and research institutes. There were 24 lectures ...
• #### 0425 - Calculus of Variations ﻿

[OWR-2004-29] (2004) - (13 Jun - 19 Jun 2004)
The workshop continued the longstanding biannual series at Oberwolfach on Calculus of Variations. This Oberwolfach series provides an imporant service to the mathematics community, being currently the only periodic in ...
• #### 0828 - Calculus of Variations ﻿

[OWR-2008-31] (2008) - (06 Jul - 12 Jul 2008)
This workshop attracted 44 participants, some 30\ of them women. Its main themes could be divided into three large groups (i) differential geometry; (ii) physics and materials; (iii) optimal transportation and its ...
• #### 1029 - Calculus of Variations ﻿

[OWR-2010-31] (2010) - (18 Jul - 24 Jul 2010)
Since its invention by Newton, the calculus of variations has formed one of the central techniques for studying problems in geometry, physics, and partial differential equations. This trend continues even today. On the one ...