Browsing by Title
Now showing items 268-287 of 1969
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Closed geodesics on surfaces
[SNAP-2022-013-EN] (Mathematisches Forschungsinstitut Oberwolfach, 2022-12-08)We consider surfaces of three types: the sphere, the torus, and many-holed tori. These surfaces naturally admit geometries of positive, zero, and negative curvature, respectively. It is interesting to study straight line ... -
Closed geodesics on surfaces and Riemannian manifolds
[SNAP-2017-005-EN] (Mathematisches Forschungsinstitut Oberwolfach, 2017-12-07)Geodesics are special paths in surfaces and so-called Riemannian manifolds which connect close points in the shortest way. Closed geodesics are geodesics which go back to where they started. In this snapshot we talk ... -
1350 - Cluster Algebras and Related Topics
[OWR-2013-58] (2013) - (08 Dec - 14 Dec 2013)Cluster algebras are a class of commutative algebras intoduced by Fomin and Zelevinsky in 2000. Their original purpose was to obtain a combinatorial approach to Lusztig’s dual canonical bases of quantum groups and to total ... -
Cluster structures on simple complex lie groups and the Belavin-Drinfeld classification
[OWP-2011-10] (Mathematisches Forschungsinstitut Oberwolfach, 2011-05-12)We study natural cluster structures in the rings of regular functions on simple complex Lie groups and Poisson-Lie structutures compatible with these cluster structures. According to our main conjecture, each class in the ... -
0739 - Coagulation and Fragmentation Models
[OWR-2007-46] (2007) - (23 Sep - 29 Sep 2007)Analysis of coagulation and fragmentation is crucial to understanding many processes of scientific and industrial importance. In recent years this has led to intensified research activities in the areas of differential ... -
Cocharacter-closure and spherical buildings
[OWP-2015-12] (Mathematisches Forschungsinstitut Oberwolfach, 2015-07-29)Let $k$ be a field, let $G$ be a reductive $k$-group and $V$ an affine $k$-variety on which $G$ acts. In this note we continue our study of the notion of cocharacter-closed $G(k)$-orbits in $V$. In earlier work we used a ... -
Cocharacter-Closure and the Rational Hilbert-Mumford Theorem
[OWP-2014-16] (Mathematisches Forschungsinstitut Oberwolfach, 2014-12-20)For a field $k$, let $G$ be a reductive $k$-group and $V$ an affine $k$-variety on which $G$ acts. Using the notion of cocharacter-closed $G(k)$-orbits in $V$ , we prove a rational version of the celebrated Hilbert-Mumford ... -
Cocycle Superrigidity and Group Actions on Stably Finite C*-Algebras
[OWP-2017-01] (Mathematisches Forschungsinstitut Oberwolfach, 2017-01-17)Let $\Lambda $ be a countably infinite property (T) group, and let $D$ be UHF-algebra of infinite type. We prove that there exists a continuum of pairwise non (weakly) cocycle conjugate, strongly outer actions of $\Lambda ... -
The codimension
[SNAP-2018-009-EN] (Mathematisches Forschungsinstitut Oberwolfach, 2018-06-19)In this snapshot we discuss the notion of codimension, which is, in a sense, “dual” to the notion of dimension and is useful when studying the relative position of one object insider another one. -
0749 - Coding Theory
[OWR-2007-56] (2007) - (02 Dec - 08 Dec 2007)Coding theory lies naturally at the intersection of a large number of disciplines in pure and applied mathematics: algebra and number theory, probability theory and statistics, communication theory, discrete mathematics ... -
1823b - Cohomological and Metric Properties of Groups of Homeomorphisms of R
[OWR-2018-26] (2018) - (03 Jun - 09 Jun 2018)In recent years, the family of groups sharing features or design principles with classical Thompson groups has grown considerably. The workshop highlights new developments in this field with special emphasis on algorithmic ... -
0417 - Cohomological Aspects of Hamiltonian Group Actions and Toric Varieties
[OWR-2004-20] (2004) - (18 Apr - 24 Apr 2004) -
1519 - Cohomology of Finite Groups: Interactions and Applications
[OWR-2015-24] (2015) - (03 May - 09 May 2015)The cohomology of finite groups is an important tool in many subjects including representation theory and algebraic topology. This meeting was the fourth in a series that has emphasized the interactions of group cohomology ... -
0030 - Cohomology of Finite Groups: Interactions and Applications
[TB-2000-30] (2000) - (23 Jul - 29 Jul 2000) -
0536 - Cohomology of Finite Groups: Interactions and Applications
[OWR-2005-42] (2005) - (04 Sep - 10 Sep 2005)This is a report on a meeting on interactions and applications of the cohomology of finite groups. Besides several talks on the cohomology of finite groups there were talks on related subjects, in particular on the cohomology ... -
1030 - Cohomology of Finite Groups: Interactions and Applications
[OWR-2010-32] (2010) - (25 Jul - 31 Jul 2010)The cohomology of finite groups is an important tool in many subjects including representation theory and algebraic topology. This meeting was the third in a series that has emphasized the interactions of group cohomology ... -
2033 - Cohomology of Finite Groups: Interactions and Applications (hybrid meeting)
[OWR-2020-23] (2020) - (09 Aug - 15 Aug 2020)The cohomology of finite groups is an important tool in many subjects including representation theory and algebraic topology. This meeting was the fifth in a series that has emphasized the interactions of group ... -
The Colored Jones Polynomial and Kontsevich-Zagier Series for Double Twist Knots
[OWP-2017-29] (Mathematisches Forschungsinstitut Oberwolfach, 2017-10-20)Using a result of Takata, we prove a formula for the colored Jones polynomial of the double twist knots $K_{(-m,-p)}$ and $K_{(-m,p)}$ where $m$ and $p$ are positive integers. In the $(-m,-p)$ case, this leads to new ... -
0428a - Combinatorial Commutative Algebra
[OWR-2004-32] (2004) - (04 Jul - 10 Jul 2004) -
0103 - Combinatorial Convexity and Algebraic Geometry
[TB-2001-2] (2001) - (14 Jan - 20 Jan 2001)