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Tauberian theorems for vector-valued Fourier and Laplace transforms

Ralph Chill (1998)

Studia Mathematica

Let X be a Banach space and f L l 1 o c ( ; X ) be absolutely regular (i.e. integrable when divided by some polynomial). If the distributional Fourier transform of f is locally integrable then f converges to 0 at infinity in some sense to be made precise. From this result we deduce some Tauberian theorems for Fourier and Laplace transforms, which can be improved if the underlying Banach space has the analytic Radon-Nikodym property.

The Laplace derivative

Ralph E. Svetic (2001)

Commentationes Mathematicae Universitatis Carolinae

A function f : is said to have the n -th Laplace derivative on the right at x if f is continuous in a right neighborhood of x and there exist real numbers α 0 , ... , α n - 1 such that s n + 1 0 δ e - s t [ f ( x + t ) - i = 0 n - 1 α i t i / i ! ] d t converges as s + for some δ > 0 . There is a corresponding definition on the left. The function is said to have the n -th Laplace derivative at x when these two are equal, the common value is denoted by f n ( x ) . In this work we establish the basic properties of this new derivative and show that, by an example, it is more general than the generalized...

The Laplace transform on a Boehmian space

V. Karunakaran, C. Prasanna Devi (2010)

Annales Polonici Mathematici

In the literature a Boehmian space containing all right-sided Laplace transformable distributions is defined and studied. Besides obtaining basic properties of this Laplace transform, an inversion formula is also obtained. In this paper we shall improve upon two theorems one of which relates to the continuity of this Laplace transform and the other is concerned with the inversion formula.

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