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 On universal coverings of Lie tori Bull. Korean Math. Soc. 2012 Vol. 49, No. 6, 1199-1211 https://doi.org/10.4134/BKMS.2012.49.6.1199Published online November 30, 2012 Valiollah Khalili Arak University Abstract : In this paper we give an introduction to the theory of universal central extensions of perfect Lie algebras. In particular, we will provide a model for the universal coverings of Lie tori and we show that automorphisms and derivations lift to the universal coverings. We also prove that the universal covering of a Lie $\Lambda$-torus of type $\Delta$ is again a Lie $\Lambda$-torus of type $\Delta$. Keywords : root graded Lie algebras, extended affine Lie algebras and Lie tori MSC numbers : 17B67 Downloads: Full-text PDF