
doi: 10.1007/bf01217964
Affine Lie algebras may be regarded as spaces of Lie-algebra-valued meromorphic functions on \(P^ 1({\mathbb{C}})\) with poles only at 0 and \(\infty\). Similarly, the Virasoro algebra may be regarded as the meromorphic vector fields on \(P^ 1({\mathbb{C}})\) with poles only at 0 and \(\infty\). \textit{I. M. Krichever} and \textit{S. P. Novikov} [Funkts. Anal. Prilozh. 21, No.4, 47-61 (1987; Zbl 0659.17012)] generalized these algebras to any compact Riemann surface with two distinguished points \(P_{\pm}.\) The present authors show that general Krichever-Novikov algebras are isomorphic to those in the genus 0 case in two ways, corresponding to choosing local parameters at \(P_{\pm}\). In particular, the generalized grading of the Krichever-Novikov algebras is seen to be an artifact of the choice of bases.
81E40, Affine Lie algebras, String and superstring theories; other extended objects (e.g., branes) in quantum field theory, two-dimensional conformal field theories, Bogolyubov transformation, 17B67, 58G35, Two-dimensional field theories, conformal field theories, etc. in quantum mechanics, Kac-Moody (super)algebras; extended affine Lie algebras; toroidal Lie algebras, 58F07, Virasoro algebra, Riemann surface, 32G15, Infinite-dimensional Lie (super)algebras, Compact Riemann surfaces and uniformization, Kac-Moody algebra, string multiloop amplitudes, Krichever-Novikov algebras
81E40, Affine Lie algebras, String and superstring theories; other extended objects (e.g., branes) in quantum field theory, two-dimensional conformal field theories, Bogolyubov transformation, 17B67, 58G35, Two-dimensional field theories, conformal field theories, etc. in quantum mechanics, Kac-Moody (super)algebras; extended affine Lie algebras; toroidal Lie algebras, 58F07, Virasoro algebra, Riemann surface, 32G15, Infinite-dimensional Lie (super)algebras, Compact Riemann surfaces and uniformization, Kac-Moody algebra, string multiloop amplitudes, Krichever-Novikov algebras
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