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Berger–Kazdan comparison theorem
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Berger–Kazdan comparison theorem : ウィキペディア英語版
Berger–Kazdan comparison theorem
In mathematics, the Berger–Kazdan comparison theorem is a result in Riemannian geometry that gives a lower bound on the volume of a Riemannian manifold and also gives a necessary and sufficient condition for the manifold to be isometric to the ''m''-dimensional sphere with its usual "round" metric. The theorem is named after the mathematicians Marcel Berger and Jerry Kazdan.
==Statement of the theorem==
Let (''M'', ''g'') be a compact ''m''-dimensional Riemannian manifold with injectivity radius inj(''M''). Let ''vol'' denote the volume form on ''M'' and let ''c''''m''(''r'') denote the volume of the standard ''m''-dimensional sphere of radius ''r''. Then
:\mathrm (M) \geq \frac(M))},
with equality if and only if (''M'', ''g'') is isometric to the ''m''-sphere S''m'' with its usual round metric.

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