By J. P. May

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**Sample text**

When X is weak Hausdorff, this holds if and only if the intersection of A with each compact subset of X is closed. A space X is a “k-space” if every compactly closed subspace is closed. A space X is “compactly generated” if it is a weak Hausdorff k-space. For example, any locally compact space and any weak Hausdorff space that satisfies the first axiom of countability (every point has a countable neighborhood basis) is compactly generated. We have expressed the definition in a form that should make the following statement clear.

There is a functor E (−) : O(G) −→ Cov(B) that is an equivalence of categories. For each subgroup H of G, the covering p : E (G/H) −→ B has a canonical base object e in its fiber over b such that p(π(E (G/H), e)) = H. Moreover, Fb = G/H as a G-set and, for a G-map α : G/H −→ G/K in O(G), the restriction of E (α) : E (G/H) −→ E (G/K) to fibers over b coincides with α. Proof. The idea is that, up to bijection, StE (G/H) (e) must be the same set for each H, but the nature of its points can differ with H.

Abstractions of these ideas are at the heart of modern axiomatic treatments of homotopical algebra and of the foundations of algebraic K-theory. The theories of cofiber and fiber sequences illustrate an important, but informal, duality theory, known as Eckmann-Hilton duality. It is based on the adjunction between Cartesian products and function spaces. Our standing hypothesis that all spaces in sight are compactly generated allows the theory to be developed without further restrictions on the given spaces.