A surname.

(topology, of a topological space) Such that any open cover has a countable subcover.

(topology) A topological space such that any open cover of the space has a countable subcover.

plural of Lindelöf space

(mathematics) An important theorem on the existence and uniqueness of solutions to first-order equations with given initial conditions.

(topology) A theorem which states that for any open covering of some given set in Euclidean n-space there is an open subcovering (of that same set) which is countable.