Now showing items 1487-1506 of 1697

• #### Solving quadratic equations in many variables ﻿

[SNAP-2017-012-EN] (Mathematisches Forschungsinstitut Oberwolfach, 2017-12-30)
Fields are number systems in which every linear equation has a solution, such as the set of all rational numbers $\mathbb{Q}$ or the set of all real numbers $\mathbb{R}$. All fields have the same properties in relation ...
• #### Some Combinatorial Identities Related to Commuting Varieties and Hilbert Schemes ﻿

[OWP-2011-02] (Mathematisches Forschungsinstitut Oberwolfach, 2011)
In this article we explore some of the combinatorial consequences of recent results relating the isospectral commuting variety and the Hilbert scheme of points in the plane.
• #### Some Results on Reducibility of Parabolic Induction for Classical Groups ﻿

[OWP-2017-09] (Mathematisches Forschungsinstitut Oberwolfach, 2017-03-30)
Given a (complex, smooth) irreducible representation $\pi$ of the general linear group over a non-archimedean local field and an irreducible supercuspidal representation $\sigma$ of a classical group, we show that ...
• #### Some Results Related to Schiffer's Problem ﻿

[OWP-2018-18] (Mathematisches Forschungsinstitut Oberwolfach, 2018-08-16)
We consider the following semilinear overdetermined problem on a two dimensional bounded or unbounded domain $\Omega$ with analytic boundary $\partial\Omega$ having at least one bounded connected component \begin{eqnarray*} ...
• #### Space-Time Euler Discretization Schemes for the Stochastic 2D Navier-Stokes Equations ﻿

[OWP-2020-12] (Mathematisches Forschungsinstitut Oberwolfach, 2020-05-06)
We prove that the implicit time Euler scheme coupled with finite elements space discretization for the 2D Navier-Stokes equations on the torus subject to a random perturbation converges in $L^2(\Omega)$, and describe the ...
• #### 1711 - Space-time Methods for Time-dependent Partial Differential Equations ﻿

[OWR-2017-15] (2017) - (12 Mar - 18 Mar 2017)
Modern discretizations of time-dependent PDEs consider the full problem in the space-time cylinder and aim to overcome limitations of classical approaches such as the method of lines (first discretize in space and then ...
• #### Spaces of Riemannian metrics ﻿

[SNAP-2017-010-EN] (Mathematisches Forschungsinstitut Oberwolfach, 2017-12-28)
Riemannian metrics endow smooth manifolds such as surfaces with intrinsic geometric properties, for example with curvature. They also allow us to measure quantities like distances, angles and volumes. These are the ...
• #### 0009b - Sparse Approximation of Non-Local Operators ﻿

[TB-2000-10] (2000) - (27 Feb - 04 Mar 2000)
• #### 0912 - Sparse Recovery Problems in High Dimensions: Statistical Inference and Learning Theory ﻿

[OWR-2009-16] (2009) - (15 Mar - 21 Mar 2009)
The statistical analysis of high dimensional data requires new techniques, extending results from nonparametric statistics, analysis, probability, approximation theory, and theoretical computer science. The main problem ...
• #### 0636 - Spatial Random Processes and Statistical Mechanics ﻿

[OWR-2006-41] (2006) - (03 Sep - 09 Sep 2006)
The workshop focused on the broad area of spatial random processes and their connection to statistical mechanics. The subjects of interest included random walk in random environment, interacting random walks, polymer models, ...
• #### Spatial-Skin Effect for a Spectral Problem with "Slightly Heavy" Concentrated Masses in a Thick Cascade Junction ﻿

[OWP-2012-10] (Mathematisches Forschungsinstitut Oberwolfach, 2012-07-03)
The asymptotic behavior (as $\varepsilon \to 0$) of eigenvalues and eigenfunctions of a boundary- value problem for the Laplace operator in a thick cascade junction with concentrated masses is studied. This cascade junction ...
• #### Special values of zeta functions and areas of triangles ﻿

[SNAP-2015-010-EN] (Mathematisches Forschungsinstitut Oberwolfach, 2015)
In this snapshot we give a glimpse of the interplay of special values of zeta functions and volumes of triangles. Special values of zeta functions and their generalizations arise in the computation of volumes of moduli ...
• #### 0449 - Spectral Analysis of Partial Differential Equations ﻿

[OWR-2004-53] (2004) - (28 Nov - 04 Dec 2004)
In this workshop talks on discrete spectra, including Lieb-Thirring estimates and properties of resonances were presented. The connection between continuous and discrete spectra was discussed. Various characteristics of ...
• #### Spectral Continuity for Aperiodic Quantum Systems II. Periodic Approximations in 1D ﻿

[OWP-2018-27] (Mathematisches Forschungsinstitut Oberwolfach, 2018-12-17)
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 ...
• #### Spectral Sequences in Combinatorial Geometry: Cheeses, Inscribed Sets, and Borsuk-Ulam Type Theorems ﻿

[OWP-2010-08] (Mathematisches Forschungsinstitut Oberwolfach, 2010-03-12)
Algebraic topological methods are especially suited to determining the nonexistence of continuous mappings satisfying certain properties. In combinatorial problems it is sometimes possible to define a mapping from a space ...
• #### 1740 - Spectral Structures and Topological Methods in Mathematical Quasicrystals ﻿

[OWR-2017-46] (2017) - (01 Oct - 07 Oct 2017)
The mathematical theory of aperiodic order grew out of various predecessors in discrete geometry, harmonic analysis and mathematical physics, and developed rapidly after the discovery of real world quasicrystals in 1982 ...
• #### 1502 - Spectral Theory and Weyl Functions ﻿

[OWR-2015-1] (2015) - (04 Jan - 10 Jan 2015)
The focus of the workshop was on the interplay between spectral theory of differential operators, system theory, inverse problems and properties of associated classes of analytic functions, among them the classical ...
• #### 0431 - Spectral Theory in Banach Spaces and Harmonic Analysis ﻿

[OWR-2004-36] (2004) - (25 Jul - 31 Jul 2004)
The workshop brought together 49 researchers from 11 different countries, representing two different research areas, spectral theory in Banach spaces and harmonic analysis, in order to promote the exchange of methods and ...
• #### Spectral triples and finite summability on Cuntz-Krieger algebras ﻿

[OWP-2014-03] (Mathematisches Forschungsinstitut Oberwolfach, 2014-05-13)
We produce a variety of odd bounded Fredholm modules and odd spectral triples on Cuntz-Krieger algebras by means of realizing these algebras as "the algebra of functions on a non-commutative space" coming from a sub shift ...
• #### Spherical Actions on Flag Varieties ﻿

[OWP-2014-04] (Mathematisches Forschungsinstitut Oberwolfach, 2014-04-25)
For every finite-dimensional vector space $V$ and every $V$ -flag variety $X$ we list all connected reductive subgroups in $GL(V)$ acting spherically on $X$.