Browsing 1  Oberwolfach Preprints (OWP) by MSC "37"
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Applications of Nijenhuis Geometry III: Frobenius Pencils and Compatible NonHomogeneous Poisson Structures
[OWP202201] (Mathematisches Forschungsinstitut Oberwolfach, 20220120)We consider multicomponent local Poisson structures of the form $\mathcal P_3 + \mathcal P_1$, under the assumption that the third order term $\mathcal P_3$ is DarbouxPoisson and nondegenerate, and study the Poisson ... 
Cocycle Superrigidity and Group Actions on Stably Finite C*Algebras
[OWP201701] (Mathematisches Forschungsinstitut Oberwolfach, 20170117)Let $\Lambda $ be a countably infinite property (T) group, and let $D$ be UHFalgebra of infinite type. We prove that there exists a continuum of pairwise non (weakly) cocycle conjugate, strongly outer actions of $\Lambda ... 
Demailly’s Notion of Algebraic Hyperbolicity: Geometricity, Boundedness, Moduli of Maps
[OWP201820] (Mathematisches Forschungsinstitut Oberwolfach, 20181008)Demailly's conjecture, which is a consequence of the GreenGriffithsLang conjecture on varieties of general type, states that an algebraically hyperbolic complex projective variety is Kobayashi hyperbolic. Our aim is to ... 
Demailly’s Notion of Algebraic Hyperbolicity: Geometricity, Boundedness, Moduli of Maps (Revised Edition)
[OWP201820.2] (Mathematisches Forschungsinstitut Oberwolfach, 20200123)Demailly's conjecture, which is a consequence of the GreenGriffthsLang conjecture on varieties of general type, states that an algebraically hyperbolic complex projective variety is Kobayashi hyperbolic. Our aim is to ... 
Discretization of Inherent ODEs and the Geometric Integration of DAEs with Symmetries
[OWP202210] (Mathematisches Forschungsinstitut Oberwolfach, 20220608)Discretization methods for differentialalgebraic equations (DAEs) are considered that are based on the integration of an associated inherent ordinary differential equation (ODE). This allows to make use of any discretization ... 
Fibonaccilike unimodal inverse limit spaces
[OWP201003] (Mathematisches Forschungsinstitut Oberwolfach, 2010039)We study the structure of inverse limit space of socalled Fibonaccilike tent maps. The combinatorial constraints implied by the Fibonaccilike assumption allows us to introduce certain chains that enable a more detailed ... 
Homology and $K$Theory of TorsionFree Ample Groupoids and Smale Spaces
[OWP202020] (Mathematisches Forschungsinstitut Oberwolfach, 20201009)Given an ample groupoid, we construct a spectral sequence with groupoid homology with integer coefficients on the second sheet, converging to the $K$groups of the groupoid C*algebra when the groupoid has torsionfree ... 
HölderDifferentiability of Gibbs Distribution Functions
[OWP200713] (Mathematisches Forschungsinstitut Oberwolfach, 20070329)In this paper we give nontrivial applications of the thermodynamic formalism to the theory of distribution functions of Gibbs measures (devil’s staircases) supported on limit sets of finitely generated conformal iterated ... 
The ingram conjecture
[OWP201002] (Mathematisches Forschungsinstitut Oberwolfach, 2010038)We prove the Ingram Conjecture, i.e., we show that the inverse limit spaces of every two tent maps with different slopes in the interval [1,2] are nonhomeomorphic. Based on the structure obtained from the proof, we also ... 
Linking and Closed Orbits
[OWP201315] (Mathematisches Forschungsinstitut Oberwolfach, 20130610)We show that the Lagrangian of classical mechanics on a Riemannian manifold of bounded geometry carries a periodic solution of motion with prescribed energy, provided the potential satis es an asymptotic growth ... 
Local and Global Canonical Forms for DifferentialAlgebraic Equations with Symmetries
[OWP202205] (Mathematisches Forschungsinstitut Oberwolfach, 20220221)Linear timevarying differentialalgebraic equations with symmetries are studied. The structures that we address are selfadjoint and skewadjoint systems. Local and global canonical forms under congruence are presented ... 
Noncommutative topological entropy of endomorphismus of Cuntz Algebras
[OWP200812] (Mathematisches Forschungsinstitut Oberwolfach, 20080316)Noncommutative topological entropy estimates are obtained for ‘finite range’ endomorphisms of Cuntz algebras,generalising known results for the canonical shift endomorphisms. Exact values are computed for a class of ... 
Noncompact harmonic manifolds
[OWP201308] (Mathematisches Forschungsinstitut Oberwolfach, 20130410)The Lichnerowicz conjecture asserts that all harmonic manifolds are either flat or locally symmetric spaces of rank 1. This conjecture has been proved by Z.I. Szab ́o [Sz] for harmonic manifolds with compact universal ... 
On periodic solutions and global dynamics in a periodic differential delay equation
[OWP201408] (Mathematisches Forschungsinstitut Oberwolfach, 20140513)Several aspects of global dynamics and the existence of periodic solutions are studied for the scalar differential delay equation $x'(t) = a(t)f(x([tK]))$, where $f(x)$ is a continuous negative feedback function, $x \cdot ... 
Spectral Continuity for Aperiodic Quantum Systems II. Periodic Approximations in 1D
[OWP201827] (Mathematisches Forschungsinstitut Oberwolfach, 20181217)The existence and construction of periodic approximations with convergent spectra is crucial in solid state physics for the spectral study of corresponding Schrödinger operators. In a forthcoming work [9] this task was ... 
Weak Expansiveness for Actions of Sofic Groups
[OWP201405] (Mathematisches Forschungsinstitut Oberwolfach, 20140425)In this paper, we shall introduce $h$expansiveness and asymptotical $h$expansiveness for actions of sofic groups. By the definitions, each hexpansive action of sofic groups is asymptotically $h$expansive. We show that ... 
The Weyl group of the Cuntz algebra
[OWP201131] (Mathematisches Forschungsinstitut Oberwolfach, 20110528)The Weyl group of the Cuntz algebra $\mathcal{O}_n$ is investigated. This is (isomorphic to) the group of polynomial automorphisms $\lambda_u$ of $\mathcal{O}_n$, namely those induced by unitaries u that can be written ...