Permanence of a nonlinear mutualism model with time varying delay

Volume 19, Issue 2, pp 129--135 http://dx.doi.org/10.22436/jmcs.019.02.07
Publication Date: May 15, 2019 Submission Date: January 26, 2019 Revision Date: January 29, 2019 Accteptance Date: April 30, 2019

Authors

Runxin Wu - Mathematics and Physics Institute, Fujian University of Technology, Fuzhou, Fujian, 350014, P. R. China.


Abstract

Sufficient conditions are obtained for the permanence of the following nonlinear mutualism model with time varying delay \[ \frac{dN_1(t)}{dt}= r_1(t)N_1(t)\left[\frac{K_1(t)+\alpha_1(t)N_2^{\beta_1}(t-\tau_2(t))}{ 1+ N_2^{\beta_1}(t-\tau_2(t))}-N_1^{\delta_1}(t-\sigma_1(t))\right], \] \[ \frac{dN_2(t)}{dt}= r_2(t)N_2(t)\left[\frac{K_2(t)+\alpha_2(t)N_1^{\beta_2}(t-\tau_1(t))}{ 1+N_1^{\beta_2}(t-\tau_1(t)}-N_2^{\delta_2}(t-\sigma_2(t))\right], \] where \(r_i, K_i, \alpha_i\), \(\tau_i\), and \(\sigma_i, i=1,2\) are continuous functions bounded above and below by positive constants, \( \alpha_i>K_i, i=1,2 ,\) and \(\beta_i, \delta_i, i=1, 2\) are all positive constants.


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ISRP Style

Runxin Wu, Permanence of a nonlinear mutualism model with time varying delay, Journal of Mathematics and Computer Science, 19 (2019), no. 2, 129--135

AMA Style

Wu Runxin, Permanence of a nonlinear mutualism model with time varying delay. J Math Comput SCI-JM. (2019); 19(2):129--135

Chicago/Turabian Style

Wu, Runxin. "Permanence of a nonlinear mutualism model with time varying delay." Journal of Mathematics and Computer Science, 19, no. 2 (2019): 129--135


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