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Agmon's inequality : ウィキペディア英語版
Agmon's inequality
In mathematical analysis, Agmon's inequalities, named after Shmuel Agmon,〔Lemma 13.2, in: Agmon, Shmuel, ''Lectures on Elliptic Boundary Value Problems'', AMS Chelsea Publishing, Providence, RI, 2010. ISBN 978-0-8218-4910-1.〕 consist of two closely related interpolation inequalities between the Lebesgue space L^\infty and the Sobolev spaces H^s. It is useful in the study of partial differential equations.
Let u\in H^2(\Omega)\cap H^1_0(\Omega) where \Omega\subset\mathbb^3. Then Agmon's inequalities in 3D state that there exists a constant C such that
: \displaystyle \|u\|_\leq C \|u\|_^ \|u\|_^,
and
: \displaystyle \|u\|_\leq C \|u\|_^ \|u\|_^.
In 2D, the first inequality still holds, but not the second: let u\in H^2(\Omega)\cap H^1_0(\Omega) where \Omega\subset\mathbb^2. Then Agmon's inequality in 2D states that there exists a constant C such that
: \displaystyle \|u\|_\leq C \|u\|_^ \|u\|_^.
For the n-dimensional case, choose s_1 and s_2 such that s_1< \tfrac < s_2. Then, if 0< \theta < 1 and \tfrac = \theta s_1 + (1-\theta)s_2, the following inequality holds for any u\in H^(\Omega)
: \displaystyle \|u\|_\leq C \|u\|_^ \|u\|_^
==See also==

* Ladyzhenskaya inequality
* Brezis–Gallouet inequality

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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