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math.AT2022
On Gelfand and MacPherson's combinatorial formula for Pontrjagin classes
Olakunle Abawonse, Laura Anderson
In 1992 Gelfand and MacPherson gave a local and combinatorial formula for the Pontrjagin classes of a differential manifold. We give an expanded version of their discussion and hig…
math.CO2022
Matroids of Gain Signed Graphs
Laura Anderson, Ting Su, Thomas Zaslavsky
A signed graph has edge signs. A gain graph has oriented edge gains drawn from a group. We define the combination of the two for the abelian case, in which each oriented edge of a…