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Hypercovers in topology

Daniel Dugger, Daniel C. Isaksen

math.ATarXiv:math/0111287

Abstract

We show that if U is a hypercover of a topological space X then the natural map from hocolim U to X is a weak equivalence. This fact is used to construct topological realization functors for the A1-homotopy theory of schemes over real and complex fields.

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