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- W2951934552 abstract "A metric space $X$ has {em Markov type} 2, if for any reversible finite-state Markov chain ${Z_t}$ (with $Z_0$ chosen according to the stationary distribution) and any map $f$ from the state space to $X$, the distance $D_t$ from $f(Z_0)$ to $f(Z_t)$ satisfies $E(D_t^2) le K^2 t E(D_1^2)$ for some $K=K(X) 2$) has Markov type 2; this proves a conjecture of Ball. We also show that trees, hyperbolic groups and simply connected Riemannian manifolds of pinched negative curvature have Markov type 2. Our results are applied to settle several conjectures on Lipschitz extensions and embeddings. In particular, we answer a question posed by Johnson and Lindenstrauss in 1982, by showing that for $1<q<2<p<infty$, any Lipschitz mapping from a subset of $L_p$ to $L_q$ has a Lipschitz extension defined on all of $L_p$." @default.
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- W2951934552 date "2004-10-19" @default.
- W2951934552 modified "2023-09-27" @default.
- W2951934552 title "Markov chains in smooth Banach spaces and Gromov hyperbolic metric spaces" @default.
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