This note considers the model for the survival of the red blood ceels with several delaysN'(t)=r(t) (-N(t)+m∑i=1 pie-riN(t-τi)), t≥0and establishes some new sufficient conditions which guarantee the positive equilibrium of the model being a global attractor. Our results generalize and improve the correspondently known results obtained in [1,3], and solve a conjecture in [7].
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