Geodesic
Natural $T$-functions on the cotangent bundle of a Weil bundle
Czechoslovak Mathematical Journal, Tome 54 (2004) no. 4, pp. 869-882.

Voir la notice de l'article provenant de la source Czech Digital Mathematics Library

A natural $T$-function on a natural bundle $F$ is a natural operator transforming vector fields on a manifold $M$ into functions on $FM$. For any Weil algebra $A$ satisfying $\dim M \ge {\mathrm width}(A)+1$ we determine all natural $T$-functions on $T^*T^AM$, the cotangent bundle to a Weil bundle $T^AM$.
Classification : 58A05, 58A20, 58A32
Keywords: natural bundle; natural operator; Weil bundle 
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     author = {Tom\'a\v{s}, Ji\v{r}{\'\i}},
     title = {Natural $T$-functions on the cotangent bundle of a {Weil} bundle},
     journal = {Czechoslovak Mathematical Journal},
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Tomáš, Jiří. Natural $T$-functions on the cotangent bundle of a Weil bundle. Czechoslovak Mathematical Journal, Tome 54 (2004) no. 4, pp. 869-882. http://geodesic.mathdoc.fr/item/CMJ_2004__54_4_a3/