fact: Record planar_bridgeless_plain_connected : Prop := PlanarBridgelessPlainConnected { planar_bridgeless_plain_connected_base :> planar_bridgeless_plain; planar_bridgeless_plain_connected_is_connected :> connected G }.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype path fingraph) fourcolor(hypermap jordan)