## Search

Now showing items 11-20 of 20

#### A Characterization of Semisimple Plane Polynomial Automorphisms

[OWP-2008-08] (Mathematisches Forschungsinstitut Oberwolfach, 2008-03-12)

It is well-known that an element of the linear group $GL_n(\mathbb{C})$ is semisimple if and only if its conjugacy class is Zariski closed. The aim of this paper is to show that the same result holds for the group of complex ...

#### Nonlinear optimization over a Weighted Independence System

[OWP-2008-10] (Mathematisches Forschungsinstitut Oberwolfach, 2008-03-14)

We consider the problem of optimizing a nonlinear objective function over a weighted independence system presented by a linear-optimization oracle. We provide a polynomial-time algorithm that determines an r-best solution ...

#### Noncommutative topological entropy of endomorphismus of Cuntz Algebras

[OWP-2008-12] (Mathematisches Forschungsinstitut Oberwolfach, 2008-03-16)

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 ...

#### On the δ=const Collisions of Singularities of Complex Plane Curves

[OWP-2008-15] (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 equi-normalizable or ...

#### Epsilon-hypercyclic operators

[OWP-2008-19] (Mathematisches Forschungsinstitut Oberwolfach, 2008-03-19)

For each fixed number $\varepsilon$ in $(0, 1)$ we construct a bounded linear operator on the Banach space $\ell_1$ having a certain orbit which intersects every cone of aperture $\varepsilon$, but with every orbit avoiding ...

#### Quantities that frequency-dependent selection maximizes

[OWP-2008-18] (Mathematisches Forschungsinstitut Oberwolfach, 2008-03-18)

We consider a model of frequency-dependent 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 ...

#### Non-Standard Behavior of Density Estimators for Sums of Squared Observations

[OWP-2008-07] (Mathematisches Forschungsinstitut Oberwolfach, 2008-03-11)

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 U-statistic, ...

#### On the Directionally Newton-non-degenerate Singularities of Complex Hypersurfaces

[OWP-2008-16] (Mathematisches Forschungsinstitut Oberwolfach, 2008)

We introduce a minimal generalization of Newton-non-degenerate singularities of hypersurfaces. Roughly speaking, an isolated hypersurface singularity is called directionally Newton-non-degenerate if the local embedded ...

#### Weyl-Titchmarsh Functions of Vector-Valued Sturm-Liouville Operators on the Unit Interval

[OWP-2008-13] (Mathematisches Forschungsinstitut Oberwolfach, 2008)

The matrix-valued Weyl-Titchmarsh functions $M(\lambda)$ of vector-valued Sturm-Liouville operators on the unit interval with the Dirichlet boundary conditions are considered. The collection of the eigenvalues (i.e., poles ...

#### Stratifying modular representations of finite groups

[OWP-2008-20] (Mathematisches Forschungsinstitut Oberwolfach, 2008-03-20)

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 ...