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math.DG2016★ 5 cited
Analytic definition of spin structure
Zhirayr Avetisyan, Yan-Long Fang, Nikolai Saveliev +1
We work on a parallelizable time-orientable Lorentzian 4-manifold and prove that in this case the notion of spin structure can be equivalently defined in a purely analytic fashion.…
math.GR2016★ 7 cited
The structure of almost Abelian Lie algebras
Zhirayr Avetisyan
An almost Abelian Lie algebra is a non-Abelian Lie algebra with a codimension 1 Abelian ideal. Most 3-dimensional real Lie algebras are almost Abelian, and they appear in every bra…