New Monotonicity Formulae for Semi-linear Elliptic and Parabolic Systems

Details New Monotonicity Formulae for Semi-linear Elliptic and Parabolic Systems New Monotonicity Formulae for Semi-linear Elliptic and Parabolic Systems

2005-10-10

arxiv.org/abs/math/0510183v1

Mathematics

Analysis of PDEs

38 pages

Scientific paper

In this paper, we establish a general monotonicity formula of the following elliptic system $$ \Delta u_i+f_i(u_1,...,u_m)=0 \quad {\rm in} \Omega, \label{0.1} $$ where $\Omega\subset\subset \mathbb{R}^n$ is a bounded domain, $(f_i(u_1,...,u_m))=\nabla F(\vec{u})$, and $F(\vec{u})$ is a given smooth function of $\vec{u}=(u_1,...,u_m)$, $m,n$ are two positive integers. We also set up a new monotonicity formula for the following parabolic system $$ \partial_t u_i-\Delta u_i-f_i(u_1,...,u_m)=0, in (t_1, t_2)\times \mathbb{R}^n, $$ where $t_1

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