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math.CO2015
COMs: Complexes of Oriented Matroids
Hans-Juergen Bandelt, Victor Chepoi, Kolja Knauer
In his seminal 1983 paper, Jim Lawrence introduced lopsided sets and featured them as asymmetric counterparts of oriented matroids, both sharing the key property of strong eliminat…
math.CO2015
Distance-preserving subgraphs of Johnson graphs
Victor Chepoi
We give a characterization of distance--preserving subgraphs of Johnson graphs, i.e. of graphs which are isometrically embeddable into Johnson graphs (the Johnson graph ha…