Abstract
We answer a question posed by Morita concerning the non-triviality of certain secondary characteristic classes for surface bundles. In doing so we are naturally led to show that a form of Harer stability holds for surface diffeomorphism groups in homology of small degree.
Original language | English |
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Pages (from-to) | 2543-2549 |
Number of pages | 7 |
Journal | Proceedings of the American Mathematical Society |
Volume | 140 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2012 |
Externally published | Yes |