arXiv
Open Access
2026
A theory of twisted umkehr maps
Anssi Lahtinen
Abstrak
We develop a theory of umkehr maps for twisted generalized homology theories. In this theory, interesting umkehr maps, including generalizations of important classical ones, are induced by cartesian morphisms of a certain category opfibred over the category of spaces and continuous maps, making it possible to access them through universal properties.
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Anssi Lahtinen
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