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Classical results about the Lusternik-Schnirelmann category of product spaces have their analogues in the category of proper maps. By comparing the proper Lusternik-Schnirelmann category of an open manifold X with the smallest number of closed half-spaces needed to cover X, we obtain a proper analogue of Singhof’s theorem on the category of X × S1.

Minimal covers of open manifolds with half-spaces and the proper L-S category of product spaces