On the non-negativity of Green's functions.
Bollettino della Unione matematica italiana, Série 3, Tome 12 (1957) no. 3, pp. 411-413.

Voir la notice de l'article provenant de la source Biblioteca Digitale Italiana di Matematica

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     title = {On the non-negativity of {Green's} functions.},
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Bellman, Richard. On the non-negativity of Green's functions.. Bollettino della Unione matematica italiana, Série 3, Tome 12 (1957) no. 3, pp. 411-413. http://geodesic.mathdoc.fr/item/BUMI_1957_3_12_3_a5/

[1] Aronszajn, N. and K. T. Smith , A Characterization of Positive Reproducing Kernels, Application to Green's Functions Studies in Eigenvalue Problems, Technical Report 15, U. of Kansas, 1956. | Zbl