Journal
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
Volume 48, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1751-8113/48/2/025204
Keywords
Lie algebras of Lie groups; integrable systems; partial differential equations; discretization procedures for PDEs
Categories
Funding
- Italian Ministry of Education and Research
- INFN IS-CSN4 Mathematical Methods of Nonlinear Physics
- NSERC of Canada
- European Union Research Executive Agency
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The Liouville equation is well known to be linearizable by a point transformation. It has an infinite dimensional Lie point symmetry algebra isomorphic to a direct sum of two Virasoro algebras. We show that it is not possible to discretize the equation keeping the entire symmetry algebra as point symmetries. We do however construct a difference system approximating the Liouville equation that is invariant under the maximal finite subgroup SLx(2, R) circle times SLy(2, R). The invariant scheme is an explicit one and provides a much better approximation of exact solutions than a comparable standard (noninvariant) scheme and also than a scheme invariant under an infinite dimensional group of generalized symmetries.
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