fact: Definition dboundK := if (nhub - 5)%N is n.+1 then - (n * 10)%:Z else 10%:Z.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype path fingraph) mathcomp(bigop order ssralg ssrnum ssrint) fourcolor(hypermap geometry part)