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Abstract
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Let
be the K3 manifold. In this note, we discuss two methods to prove that certain
generalized Miller–Morita–Mumford classes for smooth bundles with fiber
are
nonzero. As a consequence, we fill a gap in a paper of the first author, and prove that the
homomorphism
does not split. One of the two methods of proof uses a result of Franke on the stable
cohomology of arithmetic groups that strengthens work of Borel, and may be of
independent interest.
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Keywords
characteristic classes, K3 surfaces, arithmetic groups,
cohomology
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Mathematical Subject Classification 2010
Primary: 19J35, 57R20
Secondary: 11F75, 14J28
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Milestones
Received: 3 August 2019
Revised: 25 November 2019
Accepted: 10 December 2019
Published: 20 May 2020
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