Mathematics – Analysis of PDEs
Scientific paper
2010-12-13
Mathematics
Analysis of PDEs
submitted
Scientific paper
The strong maximum principle ((SMP) in short) for subsolutions of the radiative transfer type equations is shown in this paper. We treat a general class of integro-differential equations, defined in the product space of the space variable "x" and the velocity variable "v". The equations consist of two terms : a nonlocal integral operator in v variable, and a first-order partial-differential operator in x variable. The nonlocal term represents the jump process in v direction, and the term of the first-order partial differential operator describes the drift in x direction. In particular, the drift in x is generated by the velocity variable v. Based on the idea of the propagation of maxima, we give a general sufficient condition ((A) in the paper) so that the (SMP) holds for the present class of nonlocal equations. The framework of the viscosity solution is used to formulate the problem, and the related existence and uniqueness of solutions are also given.
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