Browsing 1 - Oberwolfach Preprints (OWP) by Title
Now showing items 37-56 of 406
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The C-Map as a Functor on Certain Variations of Hodge Structure
[OWP-2021-04] (Mathematisches Forschungsinstitut Oberwolfach, 2021-03-15)We give a new manifestly natural presentation of the supergravity c-map. We achieve this by giving a more explicit description of the correspondence between projective special Kähler manifolds and variations of Hodge ... -
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 ... -
Cataland: Why the Fuß?
[OWP-2019-01] (Mathematisches Forschungsinstitut Oberwolfach, 2019-01-21)The three main objects in noncrossing Catalan combinatorics associated to a finite Coxeter system are noncrossing partitions, clusters, and sortable elements. The first two of these have known Fuß-Catalan generalizations. ... -
Categoric Aspects of Authentication
[OWP-2012-05] (Mathematisches Forschungsinstitut Oberwolfach, 2012-04-24) -
Categorical Linearly Ordered Structures
[OWP-2018-08] (Mathematisches Forschungsinstitut Oberwolfach, 2018-04-26)We prove that for every computable limit ordinal $\alpha$ there exists a computable linear ordering $\mathcal{A}$ which is $\Delta^0_\alpha$-categorical and $\alpha$ is smallest such, but nonetheless for every isomorphic ... -
A categorical model for the virtual braid group
[OWP-2011-19] (Mathematisches Forschungsinstitut Oberwolfach, 2011-05-18) -
Cauchy Completeness, Lax Epimorphisms and Effective Descent for Split Fibrations
[OWP-2023-06] (Mathematisches Forschungsinstitut Oberwolfach, 2023-06-19)For any suitable base category $\mathcal{V} $, we find that $\mathcal{V} $-fully faithful lax epimorphisms in $\mathcal{V} $-$\mathsf{Cat} $ are precisely those $\mathcal{V}$-functors $F \colon \mathcal{A} \to \mathcal{B}$ ... -
Central Limit Theorems for the Radial Spanning Tree
[OWP-2014-18] (Mathematisches Forschungsinstitut Oberwolfach, 2014)Consider a homogeneous Poisson point process in a compact convex set in d-dimensional Euclidean space which has interior points and contains the origin. The radial spanning tree is constructed by connecting each point of ... -
The Character Triple Conjecture for Maximal Defect Characters and the Prime 2
[OWP-2023-15] (Mathematisches Forschungsinstitut Oberwolfach, 2023-08-22)We prove that Späth’s Character Triple Conjecture holds for every finite group with respect to maximal defect characters at the prime 2. This is done by reducing the maximal defect case of the conjecture to the so-called ... -
A Characterization of Semisimple Plane Polynomial Automorphisms
[OWP-2008-08] (Mathematisches Forschungsinstitut Oberwolfach, 2008-03-12)It is well-known that an element of the linear group $GL_n(\mathbb{C})$ is semisimple if and only if its conjugacy class is Zariski closed. The aim of this paper is to show that the same result holds for the group of complex ... -
Characterization of Tropical Planar Curves up to Genus Six
[OWP-2022-06] (Mathematisches Forschungsinstitut Oberwolfach, 2022-03-16)We provide new forbidden criterion for realizability of smooth tropical plane curves. This in turn provides us a complete classification of smooth tropical plane curves up to genus six. -
A Cheeger Type Inequality in Finite Cayley Sum Graphs
[OWP-2019-21] (Mathematisches Forschungsinstitut Oberwolfach, 2019-07-31) - (5 May - 27 July 2019)Let $G$ be a finite group and $S$ be a symmetric generating set of $G$ with $|S| = d$. We show that if the undirected Cayley sum graph $C_{\Sigma}(G,S)$ is an expander graph and is non-bipartite, then the spectrum of its ... -
Chirality of Real Non-Singular Cubic Fourfolds and Their Pure Deformation Classification
[OWP-2019-14] (Mathematisches Forschungsinstitut Oberwolfach, 2019-05-15)In our previous works we have classified real non-singular cubic hypersurfaces in the 5-dimensional projective space up to equivalence that includes both real projective transformations and continuous variations of ... -
Classification of idempotent states on the compact quantum groups Uq(2), SUq(2) and SOq(3)
[OWP-2009-08] (Mathematisches Forschungsinstitut Oberwolfach, 2009-03-02)We give a simple characterisation of those idempotent states on compact quantum groups which arise as Haar states on quantum subgroups, show that all idempotent states on quantum groups $U_q(2)$, $SU_q(2)$, and $SO_q(3) ... -
Classification of totally real elliptic Lefschetz fibrations via necklace diagrams
[OWP-2011-13] (Mathematisches Forschungsinstitut Oberwolfach, 2011)We show that totally real elliptic Lefschetz brations that admit a real section are classified by their "real loci" which is nothing but an $S^1$-valued Morse function on the real part of the total space. We assign to ... -
The Cleavage Operad and String Topology of Higher Dimension
[OWP-2011-37] (Mathematisches Forschungsinstitut Oberwolfach, 2011) -
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 ... -
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 ...