This paper studies the effect of parameter mismatch on lag synchronization of chaotic systems with time delay in the framework of master-slave configuration. It shall be shown that lag synchronization of coupled systems may achieve weakly in the presence of small parameter mismatches. The error bound of lag-synchronization arising from the parameter mismatches is also estimated by rigorously theoretical analysis. Numerical simulations on a Lu oscillator are presented to verify the theoretical results.
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