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Classes associées à un \(\pi\)-module différentiel. (French) Zbl 0532.55023
For each graded G-module \(C_*\) (G a discrete group) an element in \(Ext^ 2_ G(H_ q(C_*),H_{q+1}(C_*))\) is defined, which leads to an explicit description of the differential \(d_ 2\) in certain spectral sequences.
Reviewer: H.Hösli

MSC:
55T10 Serre spectral sequences
18G15 Ext and Tor, generalizations, Künneth formula (category-theoretic aspects)
55R20 Spectral sequences and homology of fiber spaces in algebraic topology
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