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Now showing items 21-27 of 27
Approximation of discrete functions and size of spectrum
[OWP-2009-17] (Mathematisches Forschungsinstitut Oberwolfach, 2009-03-11)
Let Λ⊂R be a uniformly discrete sequence and S⊂R a compact set. We prove that if there exists a bounded sequence of functions in Paley-Wiener space PWs, which approximates ...
Weighted Fourier inequalities for radial functions
[OWP-2009-26] (Mathematisches Forschungsinstitut Oberwolfach, 2009-03-19)
Weighted Lp(Rn)→Lq(Rn) Fourier inequalities are studied. We prove Pitt-Boas type results on integrability with power weights of the Fourier transform of a radial function.
A new counting function for the zeros of holomorphic curves
[OWP-2009-25] (Mathematisches Forschungsinstitut Oberwolfach, 2009-03-18)
Let f1,...,fp be entire functions that do not all vanish at any point, so that (f1,...,fp) is a holomorphic curve in CPp−1. We introduce a new and more careful notion of counting the order of the ...
Positivity of the T-system cluster algebra
[OWP-2009-21] (Mathematisches Forschungsinstitut Oberwolfach, 2009-03-14)
We give the path model solution for the cluster algebra variables of the Ar T-system with generic boundary conditions. The solutions are partition functions of (strongly) non-intersecting paths on weighted graphs. The ...
Control of Volterra systems with scalar kernels
[OWP-2009-16] (Mathematisches Forschungsinstitut Oberwolfach, 2009-03-10)
Volterra observations systems with scalar kernels are studied. New sufficient conditions for admissibility of observation operators are developed and some examples are discussed.
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 ...
Optimal bounds for the colored Tverberg Problem
[OWP-2009-27] (Mathematisches Forschungsinstitut Oberwolfach, 2009-03-20)
We prove a "Tverberg type" multiple intersection theorem. It strengthens the prime case of the original Tverberg theorem from 1966, as well as the topological Tverberg theorem of Bárány et al. (1980), by adding color ...