The existence and uniqueness of nonnegative solution for a class of age-structured SEIR epidemic model;
通过初等方法，证明了此冗余系统非负解的存在唯一性。
In the second section, considering the permanent immunity factor, the SEIR epidemic model with infectious force in the latent period which makes the model more universal is investigated.
第二部分考虑了永久免疫力因素，研究了一类潜伏期具有传染力的SEIR模型，使模型更具有广泛性。
SEIR dynamic model of SARS epidemic with a latent period and permanent immune is established.
建立了带有潜伏期及终身免疫的SARS流行病的SE IR动力学模型。
SEIR dynamic model of SARS epidemic with a latent period and permanent immune is established.
建立了带有潜伏期及终身免疫的SARS流行病的SE IR动力学模型。
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