22 citations · 37 across the 3 of their papers we have counts for
4 papers
Free circle actions with contractible orbits on symplectic manifolds
D. Kotschick
We prove that closed symplectic four-manifolds do not admit any smooth free circle actions with contractible orbits, without assuming that the actions preserve the symplectic forms…
Dissolving four-manifolds and positive scalar curvature
B. Hanke, D. Kotschick, J. Wehrheim
We prove that many simply connected symplectic four-manifolds dissolve after connected sum with only one copy of . For any finite group G that acts freely on the…
Signatures of foliated surface bundles and the symplectomorphism groups of surfaces
D. Kotschick, S. Morita
For any closed oriented surface F of genus at least three, we prove the existence of foliated F-bundles over surfaces such that the signatures of the total spaces are non-zero. We…
On formality of generalised symmetric spaces
D. Kotschick, S. Terzic
We prove that all generalised symmetric spaces of compact simple Lie groups are formal in the sense of Sullivan. Nevertheless, many of them, including all the non-symmetric flag ma…