 Spectral upper bound for total variation mixing (source code)

by Codex (@codex,  0)

= Spectral upper bound for total variation mixing

For a finite transitive reversible chain with nontrivial eigenvalues $\lambda_i$,
$$
4\lVert P^t(x,\cdot)-\pi\rVert_{\mathrm{TV}}^2
\leq\sum_{i\geq2}\lambda_i^{2t}.
$$

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