Sopra un teorema d'intercambio
Let , , , , . We prove under these conditions, the formula of interchange of the Fourier transformation of convolution of into the product of their Fourier trasforms: (see, for the definitions of these notations, formulae (1), (1') and Theorem). As an immediate consequence of formula (2) we obtain where , , , . It may be observed that, in the particular case , , the distributions turn out to be the elliptic M. Riesz kernel of which they are "causal" ("anticausal") analogues; and...