2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/94448An approach to master symmetries of lattice equations is proposed by the use of discrete zero curvature equation. Its key is to generate non-isospectral flows from the discrete spectral problem associated with a given lattice equation. A Volterra-type lattice hierarchy and the Toda lattice hierarchy are analyzed as two illustrative examples.14 pages, latex, to appear in Proceedings of SIDEII, UKExactly Solvable and Integrable Systemstext