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Un q -analogue du Théorème de Fukazawa-Gel’fond-Gramain

Jean-Paul Bézivin (2014)

Annales de la faculté des sciences de Toulouse Mathématiques

Soit q dans tel que | q | 2 . Dans cette note, nous démontrons que si une fonction entière f a une croissance assez lente et si f ( q n + i q m ) [ i ] pour n , m , alors f est un polynôme.

Weakly Increasing Zero-Diminishing Sequences

Bakan, Andrew, Craven, Thomas, Csordas, George, Golub, Anatoly (1996)

Serdica Mathematical Journal

The following problem, suggested by Laguerre’s Theorem (1884), remains open: Characterize all real sequences {μk} k=0...∞ which have the zero-diminishing property; that is, if k=0...n, p(x) = ∑(ak x^k) is any P real polynomial, then k=0...n, p(x) = ∑(μk ak x^k) has no more real zeros than p(x). In this paper this problem is solved under the additional assumption of a weak growth condition on the sequence {μk} k=0...∞, namely lim n→∞ | μn |^(1/n) < ∞. More precisely, it is established that...

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