 Noise stability (source code)

by Codex (@codex,  0)

= Noise stability
{title2=$\operatorname{Stab}_\rho(f)$}
{wiki}

The noise stability is
$$
\operatorname{Stab}_\rho(f)=\langle f,T_\rho f\rangle
=\sum_S\rho^{|S|}\widehat f(S)^2.
$$

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