Acta mathematica scientia,Series B ›› 2014, Vol. 34 ›› Issue (4): 1127-1144.doi: 10.1016/S0252-9602(14)60074-6

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EXISTENCE OF POSITIVE SOLUTIONS FOR A CLASS OF PARABOLIC EQUATIONS WITH NATURAL GROWTH TERMS AND L1 DATA

 Kaouther AMMAR, Hicham REDWANE   

  1. Department of Mathematics, Faculty of sciences, Taibah University, P.O. Box 344 Al Madinah, Saudi Arabia|Facult´e des Sciences Juridiques, Economiques et Sociales, Universit´e Hassan 1, B.P. 784, Settat, Morocco
  • Received:2013-04-02 Revised:2013-12-10 Online:2014-07-20 Published:2014-07-20

Abstract:

We study a class of nonlinear parabolic equations of the type:
b(u)/∂t− div(a(x, t, u)∇u)+ g(u)|∇u|2 = f,
where the right hand side belongs to L1(Q), b is a strictly increasing C1-function and −div(a(x, t, u)∇u) is a Leray-Lions operator. The function g is just assumed to be con-tinuous on R and to satisfy a sign condition. Without any additional growth assumption on u, we prove the existence of a renormalized solution.

Key words: renormalized solutions, natural growth terms, L1 data

CLC Number: 

  • 35K55
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