Dang Vu Giang

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Recently, we investigated the effect of delay on the asymptotic behavior of the model ẋ+x = f (x(·−τ)) of population growth, when the nonlinearity f is a unimodal function. Now we prove that for large delay, there are several nonconstant (positive) periodic solutions. We also use knots theory to study periodic solutions with period 3τ . Some of our results(More)
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