Sulle equazioni alle differenze con incrementi variabili.
Constanza Borelli Forti, István Fenyö (1980)
Stochastica
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Let X be an arbitrary Abelian group and E a Banach space. We consider the difference-operators ∆n defined by induction: (∆f)(x;y) = f(x+y) - f(x), (∆nf)(x;y1,...,yn) = (∆n-1(∆f)(.;y1)) (x;y2,...,yn) (n = 2,3,4,..., ∆1=∆, x,yi belonging to X, i = 1,2,...,n; f: X -->...