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Kolloquium

Oberseminar Angewandte Analysis

Oberseminar Stochastik

Oberseminar Algebra

Kollegseminar „Kombinatorische Strukturen in der Geometrie“

Oberseminar Topologie

24.07.2019 um 15:15 Uhr in 69/E15:

Martin Frankland (University of Regina, Canada)

The DG-category of secondary cohomology operations

In joint work with Hans-Joachim Baues, we study track categories (i.e., groupoid-enriched categories) endowed with additive structure similar to that of a 1-truncated DG-category, except that composition is not assumed right linear. We show that if such a track category is right linear up to suitably coherent correction tracks, then it is weakly equivalent to a 1-truncated DG-category. This generalizes work of Baues on the strictification of secondary cohomology operations. As an application, we show that the secondary integral Steenrod algebra is strictifiable.