Harmonic functions | Inequalities

Harnack's inequality

In mathematics, Harnack's inequality is an inequality relating the values of a positive harmonic function at two points, introduced by A. Harnack. Harnack's inequality is used to prove Harnack's theorem about the convergence of sequences of harmonic functions. J. Serrin, and J. Moser generalized Harnack's inequality to solutions of elliptic or parabolic partial differential equations. Such results can be used to show the interior regularity of weak solutions. Perelman's solution of the Poincaré conjecture uses a version of the Harnack inequality, found by R. Hamilton, for the Ricci flow. (Wikipedia).

Harnack's inequality
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Norm (mathematics) | Weak solution | Poisson kernel | Ricci flow | Partial differential equation | Heat equation | Hölder condition | Harmonic function