Revision #3484 → #4024 · back to history
addedCovering spaces originate in complex analysis (Riemann surfaces)68674b584d56
addedGalois correspondence with subgroups of the fundamental group (lead)1f4118affab6
addedTwist action of ℤ/2 on X × X has fixed points9426ba81ebce
addedGroup action on a topological space by homeomorphisms6c179878f22a
addedDeck transformation groupb9cf649c97a2