Abstract
We interpret Grillet’s symmetric third cohomology classes of commutative monoids in terms of strictly symmetric monoidal abelian groupoids. We state and prove a classification result that generalizes the well-known one for strictly commutative Picard categories by Deligne, Fröhlich and Wall, and Sinh.
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Acknowledgments
The authors are much indebted to the referee, whose useful observations greatly improved our exposition. This work has been supported by ‘Dirección General de Investigación’ of Spain, Project: MTM2011-22554, and for the first and third authors also by FPU Grants FPU12-01112 and AP2010-3521, respectively.
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Communicated by Mark V. Lawson.
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Calvo-Cervera, M., Cegarra, A.M. & Heredia, B.A. On the third cohomology group of commutative monoids. Semigroup Forum 92, 511–533 (2016). https://doi.org/10.1007/s00233-015-9696-2
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DOI: https://doi.org/10.1007/s00233-015-9696-2