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On the prospective minimum of the random walk conditioned to stay non-negative https://arxiv.org/abs/2409.02215 #mathPR

On the prospective minimum of the random walk conditioned to stay non-negative

Let \begin{equation*} S_{0}=0,\quad S_{n}=X_{1}+...+X_{n},\ n\geq 1, \end{equation*} be a random walk whose increments belong without centering to the domain of attraction of a stable law with scaling constants $a_{n}$, that provide convergence as $n\rightarrow \infty $ of the distributions of the elements of the sequence $\left\{ S_{n}/a_{n},n=1,2,...\right\} $ to this stable law. Let $L_{r,n}=\min_{r\leq m\leq n}S_{m}$ be the minimum of the random walk on the interval $[r,n]$. It is shown that \begin{equation*} \lim_{r,k,n\rightarrow \infty }\mathbf{P}\left( L_{r,n}\leq ya_{k}|S_{n}\leq ta_{k},L_{0,n}\geq 0\right) ,\, t\in \left( 0,\infty \right), \end{equation*} can have five different expressions, the forms of which depend on the relationships between the parameters $r,k$ and $n$.

arxiv.org
September 6, 2024 at 3:10 AM · · feed2toot · 0 · 0 · 0
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