Quasi-morphisms on the group of area-preserving diffeomorphisms of the $2$-disk via braid groups
Recently Gambaudo and Ghys proved that there exist infinitely many quasi-morphisms on the group 𝐷𝑖𝑓𝑓_{Ω}^{∞}(𝐷²,∂𝐷²) of area-preserving diffeomorphisms of the 2-disk 𝐷². For the proof, they constructed a homomorphism from the space of quasi-morphisms on the braid grou...
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| Format: | Article |
| Language: | English |
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American Mathematical Society
2014-03-01
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| Series: | Proceedings of the American Mathematical Society, Series B |
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| Online Access: | http://www.ams.org/bproc/2014-01-05/S2330-1511-2014-00002-X/ |