Acta mathematica scientia,Series A ›› 2018, Vol. 38 ›› Issue (4): 779-799.

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Carleman Estimate for a 2×2 Strongly Coupled Partial Differential System with Nonsingular Coefficient Matrix of Principal Parts and Application to an Inverse Source Problem

Wu Bin1, Gao Ying1, Yan Lin1, Yu Jun2   

  1. 1 School of Mathematics and Statistics, College of Science, Nanjing University of Information Science and Technology, Nanjing 210044;
    2 Department of Mathematics and Statistics, The University of Vermont, Burlington VT 05401, United States
  • Received:2016-12-12 Revised:2017-10-22 Online:2018-08-26 Published:2018-08-26
  • Supported by:
    Supported by the NSFC (11661004, 11601240)

Abstract: We study a Carleman estimate for a 2×2 strongly coupled partial differential system with nonsingular coefficient matrix of principal parts. Different from the method to prove Carleman estimate for a strongly coupled hyperbolic system as in[7] and[15], we first establish a pointwise Carleman estimate by considering two equations in the governing system as a whole rather than by using diagonalization of the system. Furthermore, we prove a global Carleman estimate for this kind of strongly coupled differential system. Finally, as an application, we establish a Hölder stability for an inverse problem of determining two source functions by the boundary observation data.

Key words: Carleman estimate, Strongly coupled system, Inverse source problem, Hölder stability

CLC Number: 

  • O175.28
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