Abstract
The structure of monoidal categories in which every arrow is invertible is analyzed in this paper, where we develop a 3-dimensional Schreier-Grothendieck theory of non-abelian factor sets for their classification. In particular, we state and prove precise classification theorems for those monoidal groupoids whose isotropy groups are all abelian, as well as for their homomorphisms, by means of Leech’s cohomology groups of monoids.
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We thank the referee for this observation.
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Acknowledgements
The authors want to express their gratitud to the anonymous referee, whose helpful comments and remarks improved our exposition. This work has been supported by ‘Dirección General de Investigación’ of Spain, Project: MTM2011-22554, and for the third author also by Ministerio de Educación, Cultura y Deportes of Spain: FPU grant AP2010-3521.
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Communicated by Mark V. Lawson.
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Calvo, M., Cegarra, A.M. & Heredia, B.A. Structure and classification of monoidal groupoids. Semigroup Forum 87, 35–79 (2013). https://doi.org/10.1007/s00233-013-9470-2
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DOI: https://doi.org/10.1007/s00233-013-9470-2