Gives an unsigned determinant formula for the total weight of non-intersecting path families in upward-planar DAGs, with matrix entries being signed path counts.
Symmetry classes of spanning trees of Azte c diamonds and perfect matchings of odd squares with a unit hole
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An extension of the Lindstr\"om-Gessel-Viennot theorem
Gives an unsigned determinant formula for the total weight of non-intersecting path families in upward-planar DAGs, with matrix entries being signed path counts.