Dang Vu Giang

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First, we systematize earlier results on the global stability of the model ˙ x + µx = f (x(· − τ)) of population growth. Second, we investigate the effect of delay on the asymptotic behavior when the nonlinearity f is a unimodal function. Our results can be applied to several population models [7, 9-13] because the function f does not need to be monotone or(More)
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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