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EXISTENCE OF MULTIPLE PERIODIC SOLUTIONS TO A NONLINEAR INTEGRAL EQUATION FROM THE THEORY OF EPIDEMICS |
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| Authors: | Gao Zhanhai Li Sichun |
| Abstract: | The nonlinear integral equation(1.1) is a generalized model for the spread of diseases with seasonal dependence.In this paper,we have proved the existence of at least three nontrivial nonnegative periodic solutions to this equation. |
| Keywords: | Completely continuous operators epidemics fixed points periodic solutions |
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