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P-Laplacian : ウィキペディア英語版
P-Laplacian

In mathematics, the ''p''-Laplacian, or the ''p''-Laplace operator, is a quasilinear elliptic partial differential operator of 2nd order. It is a generalization of the Laplace operator, where p is allowed to range over 1 < p < \infty. It is written as
:\nabla \cdot (|\nabla u|^ \nabla u).
Where the |\nabla \cdot |^ operator is defined as \quad |\nabla u|^ = \left(\textstyle \left(\frac\right)^2
+ \cdots + \left(\frac\right)^2
\right )^\frac
In the special case when p=2, it is the regular Laplacian. 〔Evans, pp 356.〕

== Energy formulation ==
The solution of the ''p''-Laplace equation with Dirichlet boundary conditions
:\nabla \cdot (|\nabla u|^ \nabla u) = 0
in a domain \Omega is the minimizer of the energy functional
:J(u) = \int |\nabla u|^p \,dx
among all functions in the Sobolev space W^(\Omega) satisfying the boundary conditions in the trace sense.〔

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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