Abstract
For nth order ordinary differential equations, it is studied the role of a Jacobi last multiplier (JLM) in the reduction processes that arise from the existence of either a k parametric symmetry group or a λ-symmetry. For the reduction derived from a λ-symmetry, JLMs are inherited as integrating factors of the auxiliary equations. Several ways that have appeared recently to solve the determining equations of the λ-symmetries are also analysed. Two examples illustrate the combined use of λ-symmetries and JLMs to obtain the complete solution of the equations.
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