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NOperator[ig, functions][expr] gives the action of the operator from Noether theory for a given Lie point symmetry ig and a given set of functions on an expression expr. |
NOperator[ig, functions, JetOrder][expr] gives the action of the operator from Noether theory for a given Lie-Bäcklund symmetry ig of order JetOrder and a given set of functions on an expression expr. |