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math.CO2025
Quadratic exchange equations for Coxeter matroids
Kieran Calvert, Aram Dermenjian, Alex Fink +1
Tropicalisation (with trivial coefficients) is a process that turns a polynomial equation into a combinatorial predicate on subsets of the set of variables. We show that for each m…
math.CO2025
-fold circuits and coning in rigidity matroids
John Hewetson, Bill Jackson, Anthony Nixon +1
In 1980 Lovász introduced the concept of a double circuit in a matroid. The 2nd, 3rd and 4th authors recently generalised this notion to -fold circuits (for any natural number $…