Periodic solutions of logistic equations with time delay
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摘要
A new criterion is established for the existence of positive periodic solutions to the following delay logistic equation:

u′(t)=u(t)[r(t)−a(t)u(t)+b(t)u(t−τ)]

where r(t), a(t), b(t) are periodic continuous functions, 05b50b" title="Click to view the MathML source">a(t)>0, b(t)≥0 and r(t) has positive average.

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