On Krein's Theorem for Indeterminacy of the Classical Moment Problem
β Scribed by Henrik L. Pedersen
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 211 KB
- Volume
- 95
- Category
- Article
- ISSN
- 0021-9045
No coin nor oath required. For personal study only.
β¦ Synopsis
Krein's sufficient condition for indeterminacy states that a positive measure on the real line, having moments of all orders, is indeterminate provided it has density with respect to Lebesgue measure and that this density has a finite logarithmic integral. We generalize this result and we also give a discrete analogue.
π SIMILAR VOLUMES
It is known that, for every (a n ) # l 2 (Z) there exists a function F # C(T) such that |a n | |F (n)| for every n # Z. We prove a noncommutative version: for every matrix A=(a ij ) such that sup i &(a ij ) j & l 2 and sup j &(a ij ) i & l 2 are finite, there exists a matrix (b ij ) defining a bound
## Abstract The main theme of this paper is the discussion of a parametrized family of solutions of a finite moment problem for rational matrixβvalued functions in the nondegenerate case. We will show that each member of this family is extremal in several directions concerning some point of the ope
Dedicated to Professor S. Irie on his 70th birthday ## Communicated by Y. Shibata In this paper we consider the boundary value problem for a semilinear equation 3 1 in the interior domain. We find a time global classical solution with exponential decay property by using singular hyperbolic equat