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math.CO2021
How do 9 points look like in ?
Ricardo Strausz
The aim of this note is to give an elementary proof of the following fact: given 3 red convex sets and 3 blue convex sets in , such that every red intersects every bl…
math.CO2021
On the number of heterochromatic trees in nice and beautiful colourings of complete graphs
Juan José Montellano-Ballesteros, Eduardo Rivera-Campo, Ricardo Strausz
We introduce classes of edge-colourings of the complete graph -- that we call nice and beautiful -- and study how many heterochromatic spanning trees appear under such colourings.…