... acoboundary.Following the terminology of the proof, the curvature of any weighting is a cobound-ary, because it is the sum (in the sense of “”) of two coboundaries, ωk and thecoboundary of the ... generalization of a bijection,between the cokernel of M(Z) and the set of matching of Z?For any integer matrix M, the cokernel of MTis naturally the Pontryagin dual of the cokernel of M. In other ... journal of combinatorics 5 (1998), #R46 33[18] P. W. Kasteleyn. Graph theory and crystal physics. In F. Harary, editor, GraphTheory and Theoretical Physics. Academic Press, 1967.[19] R. Kenyon....