Maps and Δ-matroids revisited
DOI:
https://doi.org/10.26493/2590-9770.1360.465Keywords:
Matroid, Δ-matroid, cellular map, topological surfaceAbstract
Using Tutte’s combinatorial definition of a map we define a Δ-matroid purely combinatorially and show that it is identical to Bouchet’s topological definition.