Geometry of Lagrangean structures. II
Demeter Krupka (1986)
Archivum Mathematicum
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Geometry of Lagrangean structures. II
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[For the entire collection see Zbl 0699.00032.] In this interesting paper the authors show that all natural operators transforming every projectable vector field on a fibered manifold Y into a vector field on its r-th prolongation are the constant multiples of the flow operator. Then they deduce an analogous result for the natural operators transforming every vector field on a manifold M into a vector field on any bundle of contact elements over M.