ANOTHER LOOK ON RECURSION OPERATORS

Michal Marvan

Key words: Recursion operator, B\"acklund transformation, diffiety.

1991 Math. Subject Classification: 58G37; 35A30, 35Q53.

Abstract: Recursion operators of partial differential equations
are identified with B\"acklund auto-transformations
of linearized diffieties. Relations to the classical concept
and its recent Guthrie's generalization are discussed.