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Nemytskii operator : ウィキペディア英語版
Nemytskii operator
In mathematics, Nemytskii operators are a class of nonlinear operators on ''L''''p'' spaces with good continuity and boundedness properties. They take their name from the mathematician Viktor Vladimirovich Nemytskii.
==Definition==

Let Ω be a domain (an open and connected set) in ''n''-dimensional Euclidean space. A function ''f'' : Ω × R''m'' → R is said to satisfy the Carathéodory conditions if
* ''f''(''x'', ''u'') is a continuous function of ''u'' for almost all ''x'' ∈ Ω;
* ''f''(''x'', ''u'') is a measurable function of ''x'' for all ''u'' ∈ R''m''.
Given a function ''f'' satisfying the Carathéodory conditions and a function ''u'' : Ω → R''m'', define a new function ''F''(''u'') : Ω → R by
:F(u)(x) = f \big( x, u(x) \big).
The function ''F'' is called a Nemytskii operator.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Nemytskii operator」の詳細全文を読む



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