Negative Volterra Flows and Mixed Volterra Flows and Their Infinitely Many Conservation Laws

In this article, by means of considering an isospectral operator equation which corresponds to the Volterra lattice, and constructing opportune time evolution problems with negative powers of spectral parameter, and using discrete zero curvature representation, negative Volterra flows are proposed. We also propose the mixed Volterra flows, which come from positive and negative volterra flows. From the Lax representation, we demonstrate the existence of infinitely many conservation laws for the two flows and give the corresponding conserved densities and the associated fluxes formulaically. Thus their integrability is further confirmed.