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Approximation of a symmetric α-stable Lévy process by a Lévy process with finite moments of all orders

Z. Michna — 2007

Studia Mathematica

In this paper we consider a symmetric α-stable Lévy process Z. We use a series representation of Z to condition it on the largest jump. Under this condition, Z can be presented as a sum of two independent processes. One of them is a Lévy process Y x parametrized by x > 0 which has finite moments of all orders. We show that Y x converges to Z uniformly on compact sets with probability one as x↓ 0. The first term in the cumulant expansion of Y x corresponds to a Brownian motion which implies that Y x can...

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