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 $W^1_2$-estimates on the prey-predator systems with cross-diffusions and functional responses Commun. Korean Math. Soc. 2008 Vol. 23, No. 2, 211-227 Printed June 1, 2008 Seong-A Shim Sungshin Women's University Abstract : As a mathematical model proposed to understand the behaviors of interacting species, cross-diffusion systems with functional responses of prey-predator type are considered. In order to obtain $W^1_2$-estimates of the solutions, we make use of several forms of calculus inequalities and embedding theorems. We consider the quasilinear parabolic systems with the cross-diffusion terms, and without the self-diffusion terms because of the simplicity of computations. As the main result we derive the uniform $W^1_2$-bound of the solutions and obtain the global existence in time. Keywords : quasilinear parabolic systems, calculus inequalities, local existence, global existence, cross-diffusions, self-diffusions, Holling-type II functional responses, uniform bounds MSC numbers : 35K55, 35B40 Downloads: Full-text PDF

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