LIFE-SPAN OF CLASSICAL SOLUTIONS TO QUASILINEAR HYPERBOLIC SYSTEMS WITH SLOWDECAY INITIAL DATA |
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Authors: | KONG Dexing |
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Institution: | Department of Applied Mathematics, Shanghai Jiaotong University, Shanghai 200030, China. |
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Abstract: | The author considers the life-span of classical solutions to Cauchy problem for general first order quasilinear strictly hyperbolic
systems in two independent variables with “slow” decay initial data. By constructing an example, first it is illustrated that
the classical solution to this kind of Cauchy problem may blow up in a finite time, even if the system is weakly linearly
degenerate. Then some lower bounds of the life-span of classical solutions are given in the case that the system is weakly
linearly degenerate. These estimates imply that, when the system is weakly linearly degenerate, the classical solution exists
almost globally in time. Finally, it is proved that Theorems 1.1–1.3 in 2] are still valid for this kind of initial data.
Project supported by the National Natural Science Foundation of China. |
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Keywords: | Quasilinear strictly hyperbolic system Weak linear degeneracy Cauchy problem Classical solution Life-span |
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