In algebraic topology, a transgression map is a way to transfer cohomology classes.
It occurs, for example in the inflation-restriction exact sequence in group cohomology, and in integration in fibers.
It also naturally arises in many spectral sequences; see spectral sequence#Edge maps and transgressions.
The transgression map appears in the inflation-restriction exact sequence, an exact sequence occurring in group cohomology.
acts on Then the inflation-restriction exact sequence is: The transgression map is the map
Transgression is defined for general
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