The homotopy groups of a homotopy group completion
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2019
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English
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Abstract
Let M be a topological monoid with homotopy group completion ΩBM. Under a strong homotopy commutativity hypothesis on M, we show that πk(ΩBM) is the quotient of the monoid of free homotopy classes [Sk, M] by its submonoid of nullhomotopic maps.
We give two applications. First, this result gives a concrete description of the Lawson homology of a complex projective variety in terms of pointwise addition of spherical families of effective algebraic cycles. Second, we apply this result to monoids built from the unitary, or general linear, representation spaces of discrete groups, leading to results about lifting continuous families of characters to continuous families of representations.
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Ramras, D. A. (2019). The homotopy groups of a homotopy group completion. Israel Journal of Mathematics, 234(1), 81–124. https://doi.org/10.1007/s11856-019-1914-2
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Israel Journal of Mathematics
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