Korn inequality

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An inequality for vector functions , , and their derivatives, defined in some bounded domain of :




The Korn inequality is also valid for vector functions in the space obtained by completing the space with respect to the norm (2). The inequality (1) is sometimes called the second Korn inequality; the first Korn inequality being inequality (1) without the second term on the left.

The inequality was proposed by A. Korn (1908) in order to obtain an a priori estimate for the solution of non-homogeneous equations of elasticity theory.


[1] G. Fichera, "Existence theorems in elasticity theory" , Handbuch der Physik , VIa/2 , Springer (1972) pp. 347–389
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Korn inequality. Encyclopedia of Mathematics. URL:
This article was adapted from an original article by M.I. Voitsekhovskii (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article