An antimaximum principle for a degenerate parabolic problem
An antimaximum principle for a degenerate parabolic problem
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简并抛物线问题的反极大值原理
DOI:
10.57262/ade/1355854621
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发表时间:
2010
影响因子:
1.4
通讯作者:
Lourdes Tello
中科院分区:
文献类型:
--
作者:
J. F. Padial;P. Takáč;Lourdes Tello
We present a mathematical treatment of an important example of a non- Newtonian fluid flow that occurs in a model studying the penitration of water through rocky or sandy dams. This model differs from porous medium models significantly. Here, the nonlinear phenomena are described by the p-Laplacian Δpu div(|∇u| p 2 ∇u). We treat the following Dirichlet problem for the p-Laplacian with a spectral parameter l near the first eigenvalue l1: 8 > > ¶ u ¶ t Δpu = l|u| p 2 u+ f(x,t), (x,t)2 Ω◊(0, T∞); u(x,t) = 0, (x,t)2 ¶ Ω◊(0, T∞); u(x, 0) = u0(x), x2 Ω. Here, 1 0 is small enough, then there is some time T2 (0, T∞) such that every solution of problem (1) satisfies u(x,t) > 0 for all x2 Ω and all t2 (T, T∞).