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Journal of Lie Theory 35 (2025), No. 2, 359--375 Copyright Heldermann Verlag 2025 On the Centre of Crossed Modules of Lie Algebras Mariam Pirashvili Dept. Mathematical Sciences, University of Plymouth, United Kingdom mariam.pirashvili@plymouth.ac.uk [Abstract-pdf] This paper studies the relationship between crossed modules of Lie algebras and their centres. We show that the homotopy of the centre of any crossed module \(\partial : L_1\to L_0\) of Lie algebras fits in an exact sequence involving cohomology of the homotopy Lie algebras \(\pi_0(L_*)\) and \(\pi_1(L_*)\). Keywords: Crossed modules, Lie algebra cohomology, Drinfeld centre. MSC: 18G45, 17B55. [ Fulltext-pdf (144 KB)] open access. |