Abstract
For a compact polyhedron, P, the category, cat( P), of P in the sense of Lusternik and Schnirelmann is the smallest integer k such that P can be covered with k subpolyhedra each of which is null homotopic in P. The strong category, Cat( P) is the smallest integer k such that a compact polyhedron K with the same homotopy type of P can be covered k contractible subpolyhedra. We use Q-manifold theory to obtain some characterizations of the category and the strong category.
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