Schreier theory for singular extensions of categorical groups and homotopy classification^∗Footnote^∗
^∗This paper has been financially supported by DGES PB97-0829 and by NATO PST.CLG 975316

Pilar Carrasco Departamento de Álgebra, Universidad de Granada, Granada, 18071, SpainCorrespondence[email protected]

Antonio R. Garzón Departamento de Álgebra, Universidad de Granada, Granada, 18071, SpainCorrespondence[email protected]

Jesús G. Miranda Departamento de Álgebra, Universidad de Granada, Granada, 18071, SpainCorrespondence[email protected]

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AntonioR. Garzón & Aurora del Río. (2006) On ℋ1 of Categorical Groups. Communications in Algebra 34:10, pages 3691-3699.
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A. R. Garzón. (2016) Singular extensions and the second cohomology categorical group. Journal of Homotopy and Related Structures 12:2, pages 447-485.
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Pilar Carrasco, Antonio M. Cegarra & Antonio R. Garzón. (2010) The classifying space of a categorical crossed module. Mathematische Nachrichten 283:4, pages 544-567.
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Josep Elgueta. (2007) Representation theory of 2-groups on Kapranov and Voevodsky's 2-vector spaces. Advances in Mathematics 213:1, pages 53-92.
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Pilar Carrasco & J.Martı́nez Moreno. (2001) Categorical G-crossed modules and 2-fold extensions. Journal of Pure and Applied Algebra 163:3, pages 235-257.
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Schreier theory for singular extensions of categorical groups and homotopy classification^∗Footnote^∗
^∗This paper has been financially supported by DGES PB97-0829 and by NATO PST.CLG 975316

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Schreier theory for singular extensions of categorical groups and homotopy classification∗Footnote∗∗This paper has been financially supported by DGES PB97-0829 and by NATO PST.CLG 975316

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Schreier theory for singular extensions of categorical groups and homotopy classification^∗Footnote^∗
^∗This paper has been financially supported by DGES PB97-0829 and by NATO PST.CLG 975316