Pličko, Anatoli and Terenzi, Paolo:
On bibasic systems and a Retherford’s problem
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Serie 8 77 (1984), fasc. n.1-2, p. 28-34, (English)
pdf (678 Kb), djvu (655 Kb). | MR 0884374 | Zbl 0609.46008
Sunto
Ogni spazio di Banach ha un sistema bibasico $(x_{n},f_{n})$ normalizzato; inoltre ogni successione $(x_{n})$ uniformemente minimale appartiene ad un sistema biortogonale limitato $(x_{n},f_{n})$, dove $(f_{n})$ è M-basica e normante.
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