This section is devoted to studying the Gaussian Isoperimetric Inequality. This inequality is a special case of the Borell Isoperimetric Inequality (and hence also a special case of the General-Volume Majority Is Stablest Theorem); in particular, it’s the special case arising from the limit $\rho \to 1^{-}$.

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Matt Franklin: There may be two small typos in the proof of Corollary 9.32 ...Matt Franklin: Small typo at the end of the proof of Theorem 9.28 (p. 264 i...Matt Franklin: Small typo at the end of the proof of Proposition 9.19 (p. 2...Matt Franklin: Small typo in Exercise 2.8 (p. 46 in the book): stray "?" at...Ryan O'Donnell: Yes, thank you! Please keep them coming! :)Ryan O'Donnell: Good idea.Ryan O'Donnell: Absolutely right, thanks.