Suspension of Ganea fibrations and a Hop
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Lucile Vandembroucq
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Article
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2000
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Elsevier Science
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English
β 135 KB
We introduce a sequence of numerical homotopy invariants Ο i cat, i β N, which are lower bounds for the Lusternik-Schnirelmann category of a topological space X. We characterize, with dimension restrictions, the behaviour of Ο i cat with respect to a cell attachment by means of a Hopf invariant. Fur