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Weak lumping of left-invariant random walks on left cosets of finite groups

Weak lumping of left-invariant random walks on left cosets of finite groups

Let $G$ be a finite group and let $H$ be a subgroup of $G$. The left-invariant random walk driven by a probability measure $w$ on $G$ is the Markov chain in which from any state $x \in G$, the probability of stepping to $xg \in G$ is $w(g)$. The initial …