On the integrability conditions for some structures related to evolution differential equations

Paul Kersten, Iosif Krasil'shchik, Alexander Verbovetsky

Using the result by D.Gessler (Differential Geom. Appl. 7 (1997) 303-324, DIPS-9/98, http://diffiety.ac.ru/preprint/98/09_98abs.htm), we show that any invariant variational bivecto…