Comultiplication in the Serre Spectral Sequence

preprint2020arXivOpen access

Abstract

We show the homological Serre spectral sequence with coefficients in a field is a spectral sequence of coalgebras. We also identify the comultiplication on the E2E^2 page of the spectral sequence as being induced by the usual comultiplication in homology. At the end, we provide some example computations highlighting the use the co-Leibniz rule.

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