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math.GR2019
Covering groups of minimal exponent
Nicola Sambonet
Presenting a finite group by a free product of finite cyclic groups the Hopf formula for the Schur multiplier affords also a covering group, and this has minimal exponent provided…
math.GR2017
Schur's theory for partial projective representations
Mikhailo Dokuchaev, Nicola Sambonet
This article focuses on those aspects about partial actions of groups which are related to Schur's theory on projective representations. It provides an exhaustive description of th…
math.GR2013★ 17 cited
The unitary cover of a finite group and the exponent of the Schur multiplier
Nicola Sambonet
For a finite group we introduce a particular central extension, the unitary cover, having minimal exponent among those satisfying the projective lifting property. We obtain new bou…