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Pseudo-monotone operator
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Pseudo-monotone operator : ウィキペディア英語版
Pseudo-monotone operator
In mathematics, a pseudo-monotone operator from a reflexive Banach space into its continuous dual space is one that is, in some sense, almost as well-behaved as a monotone operator. Many problems in the calculus of variations can be expressed using operators that are pseudo-monotone, and pseudo-monotonicity in turn implies the existence of solutions to these problems.
==Definition==

Let (''X'', || ||) be a reflexive Banach space. A map ''T'' : ''X'' → ''X'' from ''X'' into its continuous dual space ''X'' is said to be pseudo-monotone if ''T'' is a bounded operator (not necessarily continuous) and if whenever
:u_ \rightharpoonup u \mbox X \mbox j \to \infty
(i.e. ''u''''j'' converges weakly to ''u'') and
:\limsup_ \langle T(u_), u_ - u \rangle \leq 0,
it follows that, for all ''v'' ∈ ''X'',
:\liminf_ \langle T(u_), u_ - v \rangle \geq \langle T(u), u - v \rangle.

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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