THE CLASS OF UNIVERSALITY OF INTEGRABLE AND ISOTROPIC GL(N) MIXED MAGNETS

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 constituted of an alternating mixture of GL(N) 'spins' operators at different orders of representation. The corresponding central charge is calculated by analysing the low-temperature behaviour of the associated free energy. We also comment on possible extensions of our results for more general classes of mixed systems.