G. Gaeta
Published 2005-02-09Version 1
Lambda-symmetries of ODEs were introduced by Muriel and Romero, and discussed by C. Muriel in her talk at SPT2001. Here we provide a geometrical characterization of lambda-prolongations, and a generalization of these -- and of lambda-symmetries -- to PDEs and systems thereof.
Journal: Proceedings of the conference "SPT2004 - Symmetry and Perturbation Theory"; G. Gaeta, B. Prinari, S. Rauch and S. Terracini eds., World Scientific 2005
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