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math.CO2020
Elastic elements in 3-connected matroids
George Drummond, Zachary Gershkoff, Susan Jowett +2
It follows by Bixby's Lemma that if is an element of a -connected matroid , then either ${\rm co}(M\delete e)$, the cosimplification of $M\delete e$, or ,…
math.CO2020
Recognising Graphic and Matroidal Connectivity Functions
Nathan Bowler, Susan Jowett
A {\em connectivity function} on a set is a function such that , that for all , and that $λ(X\cap Y)+λ(…