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Andreas Floer died on May 15th, 1991. This is the first of several joint papers concerned with a symplectic homology theory
Supported in part by DFG-SFB 237 and DAAD-Procope
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Floer, A., Hofer, H. Coherent orientations for periodic orbit problems in symplectic geometry. Math Z 212, 13–38 (1993). https://doi.org/10.1007/BF02571639
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DOI: https://doi.org/10.1007/BF02571639