The class of universality of integrable and isotropic GL(N) mixed magnets

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Abstract
We discuss a class of transfer matrix built by a particular combination of isomorphic and non-isomorphic GL(N) invariant vertex operators. We construct a conformally invariant magnet co nstituted of an alternating mixture of GL(N) ``spins'' operators at different order of represent ation. The corresponding central charge is calculated by analysing the low temperature beha viour of the associated free energy. We also comment on possible extensions of our results for more general classes of mixed systems.

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