The Classical Maximum Principle

The Classical Maximum Principle
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经典极大值原理

DOI:
10.1007/978-3-642-61798-0_3
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发表时间:
1977
期刊:
--
影响因子:
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通讯作者:
N. Trudinger
N. Trudinger
中科院分区:
--
文献类型:
--
作者:
D. Gilbarg;N. Trudinger

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本章的目的是将第2章中导出的拉普拉斯算子的经典最大值原理推广到形式为$$Lu \equiv {a^{ij}}\left的线性椭圆微分算子(x \right){D_{ij}}u + {B^i}\left(x \right){D_i}u + c\left(x \right)u,\quad {a^{ij}} = {a^{ji}},$$其中x =(x1,...,xn)位于n ∈ n,n ∈ 2的域Ω中。除非另有说明,否则将假定u属于C2(Ω)。这里遵循的求和惯例是,重复下标表示从1吨开始求和,L始终表示运算符(3.1)。
The purpose of this chapter is to extend the classical maximum principles for the Laplace operator, derived in Chapter2, to linear elliptic differential operators of the form $$Lu \equiv {a^{ij}}\left( x \right){D_{ij}}u + {b^i}\left( x \right){D_i}u + c\left( x \right)u,\quad {a^{ij}} = {a^{ji}},$$ wherex= (x1, … ,xn) lies in a domain Ω of ℝn,n⩾ 2. It will be assumed, unless otherwise stated, thatubelongs toC2(Ω). The summation convention that repeated indices indicate summation from 1 tonis followed here as it will be throughout.Lwill always denote the operator (3.1).