Tomohiko Ishida

most citedQuasi-morphisms on the group of area-preserving diffeomorphisms of the 2-disk via braid groups

1 citations · 1 across the 2 of their papers we have counts for

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2 papers

math.GT2014

Homomorphisms on groups of volume-preserving diffeomorphisms via fundamental groups

Tomohiko Ishida

Let $M$ be a closed manifold. Polterovich constructed a linear map from the vector space of quasi-morphisms on the fundamental group $π_{1} (M)$ of $M$ to the space of quasi-morphis…

math.DS2012★ 1 cited

Quasi-morphisms on the group of area-preserving diffeomorphisms of the 2-disk via braid groups

Tomohiko Ishida

Recently Gambaudo and Ghys proved that there exist infinitely many quasi-morphisms on the group $Diff_{Ω}^{\infty} (D^{2}, \partial D^{2})$ of area-preserving diffeomorphisms of the…