TY JOUR TI Spaces of constant curvatere, the Liouville equation and contractions of Lie algebras KW Liouville equation KW contractions of Lie groups JO Proceedings of the Komi Science Centre of the Ural Division of the Russian Academy of Sciences AU Kostyakov, I.V. AU Kuratov, V.V. PY 2023 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"