Pełnotekstowe zasoby PLDML oraz innych baz dziedzinowych są już dostępne w nowej Bibliotece Nauki.
Zapraszamy na https://bibliotekanauki.pl

PL EN

Preferencje
Język
Widoczny [Schowaj] Abstrakt
Liczba wyników
• # Artykuł - szczegóły

## Bulletin of the Polish Academy of Sciences. Mathematics

2006 | 54 | 2 | 113-124

## Schroeder-Bernstein Quintuples for Banach Spaces

EN

### Abstrakty

EN
Let X and Y be two Banach spaces, each isomorphic to a complemented subspace of the other. In 1996, W. T. Gowers solved the Schroeder-Bernstein Problem for Banach spaces by showing that X is not necessarily isomorphic to Y. In this paper, we obtain necessary and sufficient conditions on the quintuples (p,q,r,s,t) in ℕ for X to be isomorphic to Y whenever
⎧$X ~ X^p ⊕ Y^q$,

⎩ $Y^t ~ X^r ⊕ Y^s$.
Such quintuples are called Schroeder-Bernstein quintuples for Banach spaces and they yield a unification of the known decomposition methods in Banach spaces involving finite sums of X and Y, similar to Pełczyński's decomposition method. Inspired by this result, we also introduce the notion of Schroeder-Bernstein sextuples for Banach spaces and pose a conjecture which would complete their characterization.

113-124

wydano
2006

### Twórcy

autor
• Department of Mathematics - IME, University of São Paulo, São Paulo 05315-970, Brazil