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Some Hermitian K-groups via geometric topology

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arxiv 2002.05255 v2 pith:5FMBV7DK submitted 2020-02-12 math.AT math.KT

classification math.ATmath.KT
keywords firstgroupsquadraticsymplecticcalculationcomputeequivalentlygeometric
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We compute the first two symplectic quadratic K-theory groups of the integers, or equivalently, the first two stable homology groups of the group of symplectic integral matrices preserving the standard quadratic refinement. The main novelty in our calculation lies in its method, which is based on high-dimensional manifold theory.

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