The natural operators and
W. M. Mikulski (2002)
Colloquium Mathematicae
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Let r and n be natural numbers. For n ≥ 2 all natural operators transforming vector fields on n-manifolds M to 1-forms on are classified. For n ≥ 3 all natural operators transforming vector fields on n-manifolds M to 2-forms on are completely described.