2 papers
math.MG2009
A Lost Counterexample and a Problem on Illuminated Polytopes
Ronald F. Wotzlaw, Günter M. Ziegler
In a Note added in proof to a 1984 paper, Daniel A. Marcus claimed to have a counterexample to his conjecture that a minimal positively k-spanning vector configuration in R^m has s…
math.CO2007
Linkages in Polytope Graphs
Axel Werner, Ronald F. Wotzlaw
A graph is k-linked if any k disjoint vertex-pairs can be joined by k disjoint paths. We improve a lower bound on the linkedness of polytopes slightly, which results in exact value…