$napis="Abstract"; include "zacatek.inc"; ?> Preprint GA 3/2002
We present easily verifiable sufficient conditions for the recursion operator to produce a hierarchy of local generalized symmetries. The important advantages of our approach are that it allows to avoid the cumbersome check of hereditarity of the recursion operator in question and that we do not assume the homogeneity of recursion operator and symmetries.
Keywords. Recursion operator, evolution system, generalized symmetries, integrability.
MS 2000 Classification. Primary: 37K10; Secondary: 35A30, 47J35. include "konec.inc"; ?>