Abstract
For two differentiable maps between two manifolds of possibly different dimensions, the local and global coincidence homology classes are introduced and studied by Bisi-Bracci-Izawa-Suwa (2016) in the framework of Čech-de Rham cohomology. We take up the problem from the combinatorial viewpoint and give some finer results, in particular for the local classes. As to the global class, we clarify the relation with the cohomology coincidence class as studied by Biasi-Libardi-Monis (2015). In fact they introduced such a class in the context of several maps and we also consider this case. In particular we define the local homology class and give some explicit expressions. These all together lead to a generalization of the classical Lefschetz coincidence point formula.
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J.-P. Brasselet: Partially supported by CNRS, Aix-Marseille University and FAPESP Grant No. 2015/06697-9. T. Suwa: Partially supported by the JSPS Grant nos. 24540060 and 16K05116.
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Brasselet, JP., Suwa, T. Local and global coincidence homology classes. J. Fixed Point Theory Appl. 23, 24 (2021). https://doi.org/10.1007/s11784-021-00857-1
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DOI: https://doi.org/10.1007/s11784-021-00857-1
Keywords
- Alexander duality
- Thom class
- Intersection product with map
- Coincidence homology class
- Lefschetz coincidence point formula