Dirac’s method for constraints: An application to quantum wires 1 arXiv:1001.2338v2 [cond-mat.str-el] 11 Mar 2011 Abstract (Dated: October 31, 2018) We investigate the Hubbard model in the limit U = ∞ , which is equivalent to the statistical condition of exclusion of double occupancy. We solve this problem using Dirac’s method for con- straints. The constraints are solved within the Bosonization method. We find that the constraints modify the anomalous commutator. We apply this theory to quantum wires at finite temperatures where the Hubbard interaction is U = ∞ . We find that the anomalous commutator induced by the constraints gives rise to the 0 . 7 anomalous conductance. D.Schmeltzer Department of Physics, City College of the City University of New York, New York,NY,10031