Address. Institute of Mathematics, Jagiellonian University, Reymonta 4, Krak\'ow, POLAND
E-mail: mikulski@im.uj.edu.pl
Abstract. The complete description of all natural operators lifting real valued functions to bundle functors on fibered manifolds is given. The full collection of all natural operators lifting projectable real valued functions to bundle functors on fibered manifolds is presented.
AMSclassification. 58A20, 53A55
Keywords. Natural operator, bundle functor