Compact coverings for Baire locally convex spaces

Very recently Tkachuk has proved that for a completely regular Hausdorff space X the space Cp(X) of continuous real-valued functions on X with the pointwise topology is metrizable, complete and separable iff Cp(X) is Baire (i.e. of the second Baire category) and is covered by a family {Kα: α ∈ NN} of compact sets such that Kα ⊂ Kβ if α β. Our general result, which extends some results of De Wilde, Sunyach and Valdivia, states that a locally convex space E is separable metrizable and complete iff E is Baire and is covered by an ordered family {Kα: α ∈ NN} of relatively countably compact sets. Consequently every Baire locally convex space which is quasi-Suslin is separable metrizable and complete. © 2006 Elsevier Inc. All rights reserved