OP-00514 Open The least-area convex cover of every unit-length planar curve MG · AIM Open Applied Problems · Moser's worm problem · universal covers
OP-00532 Open The minimum-area universal cover of planar diameter-one sets MG · AIM Open Applied Problems · sets of constant width · universal covers
OP-00848 Open Compact orbit covers of aspherical manifolds GT · AIM Open Applied Problems · aspherical manifolds · universal covers