Abstract
The concept of lattice Virasoro symmetry in completely integrable models of statistical mechanics is discussed in parallel with the notion of lattice Poincaré symmetry. To illustrate the general idea, we make an explicit construction of the full Virasoro algebra in terms of the lattice fermion field of the free-fermion six-vertex model in an external noncritical field. The conserved charges that characterize complete integrability are similarly obtained.
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