Browsing by Title
Now showing items 4-23 of 437
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Abstract Bivariant Cuntz Semigroups
[OWP-2017-04] (Mathematisches Forschungsinstitut Oberwolfach, 2017-02-13)We show that abstract Cuntz semigroups form a closed symmetric monoidal category. Thus, given Cuntz semigroups $S$ and $T$, there is another Cuntz semigroup $((S,T))$ playing the role of morphisms from $S$ to $T$. Applied ... -
Abundance of 3-Planes on Real Projective Hypersurfaces
[OWP-2014-14] (Mathematisches Forschungsinstitut Oberwolfach, 2014-11-11)We show that a generic real projective n-dimensional hypersurface of odd degree $d$, such that $4(n-2)=\binom{d+3}{3}$, contains "many" real 3-planes, namely, in the logarithmic scale their number has the same rate of ... -
The adaptive finite element method
[SNAP-2016-013-EN] (Mathematisches Forschungsinstitut Oberwolfach, 2016)Computer simulations of many physical phenomena rely on approximations by models with a finite number of unknowns. The number of these parameters determines the computational effort needed for the simulation. On the other ... -
Affine Space Fibrations
[OWP-2018-19] (Mathematisches Forschungsinstitut Oberwolfach, 2018-09-05)We discuss various aspects of affine space fibrations. Our interest will be focused in the singular fibers, the generic fiber and the propagation of properties of a given smooth special fiber to nearby fibers. -
Alexander r-Tuples and Bier Complexes
[OWP-2016-17] (Mathematisches Forschungsinstitut Oberwolfach, 2016-10)We introduce and study Alexander $r$-Tuples $\mathcal{K} = \langle K_i \rangle ^r_{i=1}$ of simplicial complexes, as a common generalization of pairs of Alexander dual complexes (Alexander 2-tuples) and r-unavoidable ... -
The algebra of differential operators for a Gegenbauer weight matrix
[OWP-2015-07] (Mathematisches Forschungsinstitut Oberwolfach, 2015-07-29)In this work we study in detail the algebra of differential operators $\mathcal{D}(W)$ associated with a Gegenbauer matrix weight. We prove that two second order operators generate the algebra, indeed $\mathcal{D}(W)$ is ... -
The algebraic combinatorial approach for low-rank matrix completion
[OWP-2013-05] (Mathematisches Forschungsinstitut Oberwolfach, 2013-03-14)We propose an algebraic combinatorial framework for the problem of completing partially observed low-rank matrices. We show that the intrinsic properties of the problem, including which entries can be reconstructed, and ... -
Algebraic geometric comparison of probability distributions
[OWP-2011-30] (Mathematisches Forschungsinstitut Oberwolfach, 2011-05-27)We propose a novel algebraic framework for treating probability distributions represented by their cumulants such as the mean and covariance matrix. As an example, we consider the unsupervised learning problem of finding ... -
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 ... -
The Algebraic Statistics of an Oberwolfach Workshop
[SNAP-2018-001-EN] (Mathematisches Forschungsinstitut Oberwolfach, 2018-02-27)Algebraic Statistics builds on the idea that statistical models can be understood via polynomials. Many statistical models are parameterized by polynomials in the model parameters; others are described implicitly by ... -
Algebraic theory of quadratic forms : generic methods and Pfister forms
(Birkhäuser Basel, 1980) -
Algebraische Transformationsgruppen und Invariantentheorie
(Birkhäuser Basel, 1989)Der. vorliegende Band enthält eine Reihe von einführenden Vorlesungen, die von verschiedenen Autoren im Rahmen von zwei DMV-Seminaren zum Thema "Algebraische Transjormationsgruppen und Invariantentheorie" gehalten wur ... -
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 ... -
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 ... -
Analytische Methoden für diophantische Gleichungen : einführende Vorlesungen
(Birkhäuser Basel, 1984) -
Aperiodic Order and Spectral Properties
[SNAP-2017-003-EN] (Mathematisches Forschungsinstitut Oberwolfach, 2017-09-14)Periodic structures like a typical tiled kitchen floor or the arrangement of carbon atoms in a diamond crystal certainly possess a high degree of order. But what is order without periodicity? In this snapshot, we are ... -
Applications of BV Type Spaces
[OWP-2019-04] (Mathematisches Forschungsinstitut Oberwolfach, 2019-02-13) -
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 ...