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.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-cm93-1-6, author = {W. M. Mikulski}, title = {The natural operators $T\_{|M fn} \textasciitilde\ T*T^{r*}$ and $T\_{|M fn} \textasciitilde\ L2T*T^{r*}$ }, journal = {Colloquium Mathematicae}, volume = {91}, year = {2002}, pages = {55-65}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-cm93-1-6} }
W. M. Mikulski. The natural operators $T_{|ℳ fₙ} ⇝ T*T^{r*}$ and $T_{|ℳ fₙ} ⇝ Λ²T*T^{r*}$ . Colloquium Mathematicae, Tome 91 (2002) pp. 55-65. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-cm93-1-6/