INVARIANT SUBSPACES AND GENERALIZATION OF NAGAOKAS THEOREM FOR THE HUBBARD-MODEL (U=INFINITY)статья
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Аннотация:The Hubbard model (U = infinity) on an arbitrary graph of sites in the presence of one hole in the system is considered. A sufficient condition for the absence of invariant subspaces of the space of states with fixed value of the z projection of the total spin that differ in the sets of possible spin configurations is found. A generalization of Nagaoka's results for bilobate graphs is given.