Acta mathematica scientia,Series B ›› 2018, Vol. 38 ›› Issue (1): 125-150.doi: 10.1016/S0252-9602(17)30121-2

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SMALL DATA SOLUTIONS OF 2-D QUASILINEAR WAVE EQUATIONS UNDER NULL CONDITIONS

Yingbo LIU1,2, Ingo WITT3   

  1. 1. Department of Mathematics and IMS, Nanjing University, Nanjing 210093, China;
    2. Department of Mathematics, China Pharmaceutical University, Nanjing 210009, China;
    3. Mathematical Institute, University of Göttingen, Bunsenstr. 3-5, Göttingen 37073, Germany
  • Received:2016-12-28 Revised:2017-04-15 Online:2018-02-25 Published:2018-02-25
  • Supported by:

    The research of LIU was partially supported by the NSFC (11571177) and the Priority Academic Program Development of Jiangsu Higher Education Institutions. The research of WITT was partially funded by the DFG through the Sino-German Project "Analysis of PDEs and Applications".

Abstract:

For the 2-D quasilinear wave equation  satisfying null condition or both null conditions, a blowup or global existence result has been shown by Alinhac. In this paper, we consider a more general 2-D quasilinear wave equation (t2-△x)u+ satisfying null conditions with small initial data and the coefficients depending simultaneously on u and ∂u. Through construction of an approximate solution, combined with weighted energy integral method, a quasi-global or global existence solution are established by continuous induction.

Key words: global existence, null condition, weighted energy estimate, continuous induction

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