Browsing 1 - Oberwolfach Preprints (OWP) by Title
Now showing items 12-31 of 399
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Algebraic Matroids with Graph Symmetry
[OWP-2014-02] (Mathematisches Forschungsinstitut Oberwolfach, 2014)This paper studies the properties of two kinds of matroids: (a) algebraic matroids and (b) finite and infinite matroids whose ground set have some canonical symmetry, for example row and column symmetry and transposition ... -
Alternative iterative methods for nonexpansive mappings, rates of convergence and applications
[OWP-2009-19] (Mathematisches Forschungsinstitut Oberwolfach, 2009)Alternative iterative methods for a nonexpansive mapping in a Banach space are proposed and proved to be convergent to a common solution to a fixed point problem and a variational inequality. We give rates of asymptotic ... -
Amorphic Complexity of Group Actions with Applications to Quasicrystals
[OWP-2021-03] (Mathematisches Forschungsinstitut Oberwolfach, 2021-02-02)In this article, we define amorphic complexity for actions of locally compact $\sigma$-compact amenable groups on compact metric spaces. Amorphic complexity, originally introduced for $\mathbb Z$-actions, is a topological ... -
Analysis and Simulation of a New Multi-Component Two-Phase Flow Model with Phase Transitions and Chemical Reactions
[OWP-2017-08] (Mathematisches Forschungsinstitut Oberwolfach, 2017-03-15)A class-II model for multi-component mixtures recently introduced in D. Bothe, W. Dreyer, Continuum thermodynamics of chemically reacting fluid mixtures, Acta Mech., 226 (2015), 1757–1805 is investigated for simple mixtures. ... -
Analytic Structure in Fibers
[OWP-2016-13] (Mathematisches Forschungsinstitut Oberwolfach, 2016-08-17)Let $B_X$ be the open unit ball of a complex Banach space $X$, and let $\mathcal{H}^\infty(B_X)$ and $\mathcal{A}_u(B_X)$ be, respectively, the algebra of bounded holomorphic functions on $B_X$ and the subalgebra of uniformly ... -
Analytic Varieties with Finite Volume Amoebas are Algebraic
[OWP-2011-33] (Mathematisches Forschungsinstitut Oberwolfach, 2011)In this paper, we study the amoeba volume of a given $k$-dimensional generic analytic variety $V$ of the complex algebraic torus $(C^*)^n$. When $n>=2k$, we show that $V$ is algebraic if and only if the volume of its amoeba ... -
Applications of BV Type Spaces
[OWP-2019-04] (Mathematisches Forschungsinstitut Oberwolfach, 2019-02-13) -
Applications of Nijenhuis Geometry III: Frobenius Pencils and Compatible Non-Homogeneous Poisson Structures
[OWP-2022-01] (Mathematisches Forschungsinstitut Oberwolfach, 2022-01-20)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 Darboux-Poisson and non-degenerate, and study the Poisson ... -
Approximation of discrete functions and size of spectrum
[OWP-2009-17] (Mathematisches Forschungsinstitut Oberwolfach, 2009-03-11)Let $\Lambda \subset \mathbb{R}$ be a uniformly discrete sequence and $S \subset \mathbb{R}$ a compact set. We prove that if there exists a bounded sequence of functions in Paley-Wiener space $PW_s$, which approximates ... -
Arm Exponent for the Gaussian Free Field on Metric Graphs in Intermediate Dimensions
[OWP-2024-01] (Mathematisches Forschungsinstitut Oberwolfach, 2024-01-08)We investigate the bond percolation model on transient weighted graphs ${G}$ induced by the excursion sets of the Gaussian free field on the corresponding metric graph. We assume that balls in ${G}$ have polynomial volume ... -
Asymptotic behavior of the eigenvalues and eigenfunctions to a spectral problem in thick cascade junction with concentrated masses
[OWP-2011-12] (Mathematisches Forschungsinstitut Oberwolfach, 2011-05-14)The asymptotic behavior (as $\varepsilon \to 0$) of eigenvalues and eigenfunctions of a boundaryvalue problem for the Laplace operator in a thick cascade junction with concentrated masses is investigated. This cascade ... -
Automatic Differentiation for ML-Familiy Languages: Correctness via Logical Relations
[OWP-2023-07] (Mathematisches Forschungsinstitut Oberwolfach, 2023-06-19) -
Averages of Shifted Convolutions of d3(n)
[OWP-2011-11] (Mathematisches Forschungsinstitut Oberwolfach, 2011-05-13)We investigate the first and second moments of shifted convolutions of the generalised divisor function $d_3(n)$. -
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 ... -
Birational Rowmotion on a Rectangle over a Noncommutative Ring
[OWP-2022-17] (Mathematisches Forschungsinstitut Oberwolfach, 2022-09-20)We extend the periodicity of birational rowmotion for rectangular posets to the case when the base field is replaced by a noncommutative ring (under appropriate conditions). This resolves a conjecture from 2014. The proof ... -
Bochner-Riesz Means at the Critical Index: Weighted and Sparse Bounds
[OWP-2023-16] (Mathematisches Forschungsinstitut Oberwolfach, 2023-11-27)We consider Bochner-Riesz means on weighted $L^p$ spaces, at the critical index $\lambda(p)=d(\frac 1p-\frac 12)-\frac 12$. For every $A_1$-weight we obtain an extension of Vargas' weak type $(1,1)$ inequality in some range ... -
Boundary Conditions for Scalar Curvature
[OWP-2021-01] (Mathematisches Forschungsinstitut Oberwolfach, 2021-01-04)Based on the Atiyah-Patodi-Singer index formula, we construct an obstruction to positive scalar curvature metrics with mean convex boundaries on spin manifolds of infinite $K$-area. We also characterize the extremal case. ... -
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 ... -
Bounded Weight Modules for Basic Classical Lie Superalgebras at Infinity
[OWP-2022-09] (Mathematisches Forschungsinstitut Oberwolfach, 2022-05-30)We classify simple bounded weight modules over the complex simple Lie superalgebras $\mathfrak{sl}(\infty |\infty)$ and $\mathfrak{osp} (m | 2n)$, when at least one of $m$ and $n$ equals $\infty$. For $\mathfrak{osp} (m | ...