Abstract
In this paper, with a free function embedded into a discrete zero-curvature equation, an integrable nonlinear differential-difference hierarchy is derived via the extension of original hierarchy with symbolic computation. Based on the Lax pair, infinitely many conservation laws and Darboux transformations are constructed for the first nonlinear differential-difference equations in the hierarchy. As an application of the Darboux transformation, some explicit solutions of those sample equations are given.
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