Extending the exact sequence of nonabelian H¹, using nonabelian H² with coefficients in crossed modules

2016/08/26 by Borovoi, Mikhail
#18G50 #20J06 #Algebraic Geometry (math.AG) #Category Theory (math.CT) #FOS: Mathematics #Group Theory (math.GR) #K-Theory and Homology (math.KT)

paper · doi:10.48550/arxiv.1608.07366

Abstract

In this note, following Dedecker and Debremaeker, we extend the cohomology exact sequence for nonabelian H¹, using nonabelian H² with coefficients in crossed modules.

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