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Dirichlet energy : ウィキペディア英語版
Dirichlet's energy
In mathematics, the Dirichlet's energy is a measure of how ''variable'' a function is. More abstractly, it is a quadratic functional on the Sobolev space . The Dirichlet energy is intimately connected to Laplace's equation and is named after the German mathematician Peter Gustav Lejeune Dirichlet.
==Definition==

Given an open set and function the Dirichlet's energy of the function  is the real number
:E() = \frac1 \int_ \| \nabla u (x) \|^ \, \mathrm V,
where denotes the gradient vector field of the function .

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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