Browsing 2008 by Title
Now showing items 720 of 20

The Nagata automorphism is shifted linearizable
[OWP200809] (Mathematisches Forschungsinstitut Oberwolfach, 20080313)A polynomial automorphism $F$ is called shifted linearizable if there exists a linear map $L$ such that $LF$ is linearizable. We prove that the Nagata automorphism $N:= (XY\DeltaZ\Delta^2,Y+Z\Delta,Z)$ where $\Delta=XZ+Y^2$ ... 
NonStandard Behavior of Density Estimators for Sums of Squared Observations
[OWP200807] (Mathematisches Forschungsinstitut Oberwolfach, 20080311)It has been shown recently that, under an appropriate integrability condition, densities of functions of independent and identically distributed random variables can be estimated at the parametric rate by a local Ustatistic, ... 
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 ... 
Nonlinear Optimization for Matroid Intersection and Extensions
[OWP200814] (Mathematisches Forschungsinstitut Oberwolfach, 20080317)We address optimization of nonlinear functions of the form $f(W_x)$ , where $f : \mathbb{R}^d \to \mathbb{R}$ is a nonlinear function, $W$ is a $d \times n$ matrix, and feasible $x$ are in some large finite set $\mathcal{F}$ ... 
Nonlinear optimization over a Weighted Independence System
[OWP200810] (Mathematisches Forschungsinstitut Oberwolfach, 20080314)We consider the problem of optimizing a nonlinear objective function over a weighted independence system presented by a linearoptimization oracle. We provide a polynomialtime algorithm that determines an rbest solution ... 
A note on k[z]Automorphisms in Two Variables
[OWP200817] (Mathematisches Forschungsinstitut Oberwolfach, 2008)We prove that for a polynomial $f \in k[x, y, z]$ equivalent are: (1)$f$ is a $k[z]$coordinate of $k[z][x,y]$, and (2) $k[x, y, z]/(f)\cong k^[2]$ and $f(x,y,a)$ is a coordinate in $k[x,y]$ for some $a \in k$. This solves ... 
On the Directionally Newtonnondegenerate Singularities of Complex Hypersurfaces
[OWP200816] (Mathematisches Forschungsinstitut Oberwolfach, 2008)We introduce a minimal generalization of Newtonnondegenerate singularities of hypersurfaces. Roughly speaking, an isolated hypersurface singularity is called directionally Newtonnondegenerate if the local embedded ... 
On the δ=const Collisions of Singularities of Complex Plane Curves
[OWP200815] (Mathematisches Forschungsinstitut Oberwolfach, 2008)We study a specific class of deformations of curve singularities: the case when the singular point splits to several ones, such that the total $\delta$ invariant is preserved. These are also known as equinormalizable or ... 
Preconditioning of Block Tridiagonal Matrices
[OWP200805] (Mathematisches Forschungsinstitut Oberwolfach, 20080309)Preconditioning methods via approximate block factorization for block tridiagonal matrices are studied. Bounds for the resulting condition numbers are given, and two methods for the recursive construction of the approximate ... 
Quantities that frequencydependent selection maximizes
[OWP200818] (Mathematisches Forschungsinstitut Oberwolfach, 20080318)We consider a model of frequencydependent selection, to which we refer as the Wildcard Model, that accommodates as particular cases a number of diverse models of biologically specific situations. Two very different ... 
Stratifying modular representations of finite groups
[OWP200820] (Mathematisches Forschungsinstitut Oberwolfach, 20080320)We classify localising subcategories of the stable module category of a finite group that are closed under tensor product with simple (or, equivalently all) modules. One application is a proof of the telescope conjecture ... 
Upper tails for intersection local times of random walks in supercritical dimensions
[OWP200802] (Mathematisches Forschungsinstitut Oberwolfach, 20080306)We determine the precise asymptotics of the logarithmic upper tail probability of the total intersection local time of $p$ independent random walks in $\mathbb{Z}^d$ under the assumption $p(d2)>d$. Our approach allows a ... 
Urn Models & Operator Ordering Procedures
[OWP200806] (Mathematisches Forschungsinstitut Oberwolfach, 20080310)Ordering of operators is purely combinatorial task involving a number of commutators shuffling components of operator expression to desired form. Here we show how it can be illustrated by simple urn models in which normal ... 
WeylTitchmarsh Functions of VectorValued SturmLiouville Operators on the Unit Interval
[OWP200813] (Mathematisches Forschungsinstitut Oberwolfach, 2008)The matrixvalued WeylTitchmarsh functions $M(\lambda)$ of vectorvalued SturmLiouville operators on the unit interval with the Dirichlet boundary conditions are considered. The collection of the eigenvalues (i.e., poles ...