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Exact solution of the invariant quantum spin chains
The Nested Bethe Ansatz is generalized to open boundary conditions. This is
used to find the exact eigenvectors and eigenvalues of the vertex
model with fixed open boundary conditions and the corresponding
invariant hamiltonian.
The Bethe Ansatz equations obtained are solved in the thermodynamic limit
giving the vertex model free energy and the hamiltonian ground state energy
including the corresponding boundary contributions.Comment: 29 page