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Issue UPDATE: in graph theory, different definitions of edge crossing numbers

by steven@pcgamer.com Agosto 5, 2020, 1:15 am 999 Views

$DeclareMathOperatorcrcrDeclareMathOperatorpcrpcr$For the pair crossing number $pcr(G)$, the short answer is yes the crossing lemma holds for drawings on the sphere, but it is not known whet…
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