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- Margit Rösler
- 1997

Based on the theory of Dunkl operators, this paper presents a general concept of multi-variable Hermite polynomials and Hermite functions which are associated with finite reflection groups on R N. The definition and properties of these generalized Hermite systems extend naturally those of their classical counterparts; partial derivatives and the usual… (More)

- Margit Rösler
- 2002

These lecture notes are intended as an introduction to the theory of rational Dunkl operators and the associated special functions, with an emphasis on positivity and asymptotics. We start with an outline of the general concepts: Dunkl operators, the intertwining operator, the Dunkl kernel and the Dunkl transform. We point out the connection with integrable… (More)

- MARGIT RÖSLER
- 2002

It is an open conjecture that generalized Bessel functions associated with root systems have a positive product formula for non-negative mul-tiplicity parameters of the associated Dunkl operators. In this paper, a partial result towards this conjecture is proven, namely a positive radial product formula for the non-symmetric counterpart of the generalized… (More)

- MARGIT RÖSLER
- 1999

1. Introduction and results. In recent years, the theory of Dunkl operators has found a wide area of applications in mathematics and mathematical physics. Besides their use in the study of multivariable orthogonality structures associated with root systems (see, for example, [D1], [D2], [He], [vD], and [R]), these operators are closely related to certain… (More)

- Margit Rösler
- 2005

In this paper we introduce probability-preserving convolution algebras on cones of positive semidefinite matrices over one of the division algebras F = R, C or H which interpolate the convolution algebras of radial bounded Borel measures on a matrix space M p,q (F) with p q. Radiality in this context means invariance under the action of the unitary group U… (More)

- Margit Rösler
- 2003

We present a construction of a wavelet-type orthonormal basis for the space of radial L 2-functions in R 3 via the concept of a radial multiresolution analysis. The elements of the basis are obtained from a single radial wavelet by usual dilations and generalized translations. Hereby the generalized translation reveals the group convolution of radial… (More)

- Margit Rösler, Marcel de Jeu
- Journal of Approximation Theory
- 2002

This paper studies the asymptotic behavior of the integral kernel of the Dunkl transform, the so-called Dunkl kernel, when one of its arguments is fixed and the other tends to infinity either within a Weyl chamber of the associated reflection group, or within a suitable complex domain. The obtained results are based on the asymptotic analysis of an… (More)

- Margit Rösler
- 2009

In this paper, we derive explicit product formulas and positive con-volution structures for three continuous classes of Heckman-Opdam hy-pergeometric functions of type BC. For specific discrete series of multi-plicities these hypergeometric functions occur as the spherical functions of non-compact Grassmann manifolds G/K over one of the (skew) fields F = R,… (More)

Dunkl operators are differential-difference operators on R N which generalize partial derivatives. They lead to generalizations of Laplace operators, Fourier transforms, heat semigroups, Hermite polynomials, and so on. In this paper we introduce two systems of biorthogonal poly-nomials with respect to Dunkl's Gaussian distributions in a quite canonical way.… (More)

- Heiko Remling, Margit Rösler
- Journal of Approximation Theory
- 2015

We study convolution algebras associated with Heckman–Opdam polynomials. For root systems of type BC we derive three continuous classes of positive convolution algebras (hypergroups) by interpolating the double coset convolution structures of compact Grassmannians U/K with fixed rank over the real, complex or quaternionic numbers. These convolution algebras… (More)