Acta mathematica scientia,Series A ›› 2015, Vol. 35 ›› Issue (5): 833-844.

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Global Existence for Some Quasi-Linear Parabolic Equations with Locally Arbitrary Growth and Memory

Ma Wenya1, Zhang Qiaofu2,3, Cui Junzhi4   

  1. 1 College of Information and Management Science, Henan Agricultural University, Zhengzhou 450002;
    2 College of Electrical Engineering, Zhejiang University, Hangzhou 310027;
    3 Ningbo Xingaoyi Co, Ltd, Zhejiang Yuyao 315400;
    4 LSEC, ICMSEC, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing 100190
  • Received:2014-02-07 Revised:2015-04-20 Online:2015-10-25 Published:2015-10-25

Abstract:

Existence theory for a kind of quasi-linear parabolic equations is established by the Schauder fixed point method. Actually a linearized map is defined by fixing the function variables in the coefficients and the right-hand term. Its domain is chosen to be bounded but a locally arbitrary growth condition is considered. Therefore its range is contained in a closed convex set through the maximum principle. This map is continuous since the solution smoothly depends on the data. Compactness is deduced from the embedding theorem, so there exists a fixed point. The coefficients are just required to be continuous with respect to the function variables, but can be only measurable with respect to the space and time variables. Moreover, memory terms are also considered.

Key words: Existence theory, Quasi-linear parabolic equations, Fixed point, Locally arbitrary growth condition

CLC Number: 

  • O175.29
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