Abstract
O’Regan et al [Journal of Applied Mathematics Letters. 23 (2010) , pp. 446-448] constructed a function as a Lyapunov function for getting stability of endemic equilibrium of a mathematical model for an epidemic. In this paper, we prove the introduced function does not satisfy some of the conditions of Lyapunov function. At last, we correct the introduced function which can help us to reach the aims in stability.
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