چکیده
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This paper aims to present two nonstandard finite difference (NFSD) methods to solve
an SIR epidemic model. The proposed methods have important properties such as positivity and
boundedness and they also preserve conservation law. Numerical comparisons confirm that the
accuracy of our method is better than that of other existing standard methods such as the second-order
Runge–Kutta (RK2) method, the Euler method and some ready-made MATLAB codes.
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