~*, time delay (?) does not affect the global stability of disease-free equilibrium.
当R_0＜1时,通过构造Lyapunov泛函,证明无病平衡点是全局渐近稳定的,在此条件下,当τ＞τ~*时,时滞τ的变化不影响无病平衡点的全局渐近稳定性。
参考来源 - 几类非线性生物数学模型的动力学行为研究·2,447,543篇论文数据，部分数据来源于NoteExpress
研究了免疫响应系统无病平衡点和正平衡点的全局稳定性问题。
The global stability of the disease-free equilibrium and the epidemic equilibrium in the immune-response system is studied.
通过构造 函数及根据 不变集原理证明了无病平衡点和地方病平衡点的全局渐近稳定性；
Then the disease-free equilibrium point and endemic equilibrium point were proved with global asymptotic stability by constructing functions and basing on the invariant set principle.
主要结论：当且仅当基本再生数小于等于时，系统存在唯一无病平衡点，且无病平衡点是全局渐近稳定。
The main conclusion drawn from this study is that: if and only if the basic productive number , the only disease-free equilibrium exists in the system and it is of global asymptotic stability.
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