Geodesic
Non-classical applications of Laplace operator
Fundamentalʹnaâ i prikladnaâ matematika, Tome 1 (1995) no. 2, pp. 533-534 
V. V. Dubrovskii. Non-classical applications of Laplace operator. Fundamentalʹnaâ i prikladnaâ matematika, Tome 1 (1995) no. 2, pp. 533-534. http://geodesic.mathdoc.fr/item/FPM_1995_1_2_a13/
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Voir la notice de l'article provenant de la source Math-Net.Ru

Differentiable function is expanded on overflowing system in such a way that the expansion may be differentiated termwise infinitely.

[1] Smelov V. V., Operatory Shturma–Liuvillya i ikh neklassicheskie prilozheniya, Nauka, Novosibirsk, 1992 | MR | Zbl