Address. Uniwersytet Jagiellonski, Instytut Matematyki, ul. Reymonta 4, 30-059 Krakow, POLAND,
E-mail: debecki@im.uj.edu.pl
Abstract. A complete classification of natural transformations of symplectic structures into Poisson's brackets as well as into Jacobi's brackets is given.
AMSclassification. 53A55, 53C15
Keywords. Natural operator, symplectic manifold, Poisson manifold, Jacobi manifold