Dang Vu Giang

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Recently, we investigated the effect of delay on the asymptotic behavior of the model ˙ x + 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(More)
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