Rafal Marcin Lochowski, Witold Marek Bednorz, Rafał Martynek
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On optimal uniform approximation of Lévy processes on Banach spaces with finite variation processes
For a general \cad Lévy process $X$ on a separable Banach
space $V$ we estimate values of $\inf_{c\ge0} \cbr{ \psi(c)+ \inf_{Y\in{\cal A}_{X}(c)}\E \TTV Y{\left[0,T\right]}{}}$,
where ${\cal A}_{X}(c)$ is the family of processes on $V$ adapted to
the natural filtration of $X$, a.s. approximating paths of $X$ uniformly with accuracy $c$, $\psi$ is a penalty function with polynomial growth and
$\TTV Y{\left[0,T\right]}{}$ denotes the total variation of the process
$Y$ on the interval $[0,T]$. Next, we apply obtained estimates in
three specific cases: Brownian motion with drift on $\R$, standard
Brownian motion on $\R^{d}$ and a symmetric $\alpha$-stable process
($\alpha\in(1,2)$) on $\R$.
期刊介绍:
The journal publishes original research and survey papers in the area of Probability and Statistics. It covers theoretical and practical aspects, in any field of these domains.
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