The active bijection between regions and simplices in supersolvable arrangements of hyperplanes.
The Tutte polynomial of a morphism of matroids I. Set-pointed matroids and matroid perspectives
We study the basic algebraic properties of a 3-variable Tutte polynomial the author has associated with a morphism of matroids, more precisely with a matroid strong map, or matroid perspective in the present paper, or, equivalently by the Factorization Theorem, with a matroid together with a distinguished subset of elements. Most algebraic properties of the usual 2-variable Tutte polynomial of a matroid generalize to the 3-variable polynomial. Among specific properties we show that the 3-variable...
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