# An instanton-invariant for 3-manifolds

@article{Floer1988AnIF, title={An instanton-invariant for 3-manifolds}, author={Andreas Floer}, journal={Communications in Mathematical Physics}, year={1988}, volume={118}, pages={215-240} }

To an oriented closed 3-dimensional manifoldM withH1(M, ℤ)=0, we assign a ℤ8-graded homology groupI*(M) whose Euler characteristic is twice Casson's invariant. The definition uses a construction on the space of instantons onM×ℝ.

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