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# Wydawnictwa / Czasopisma IMPAN / Studia Mathematica / Wszystkie zeszyty

## An approximation property with respect to an operator ideal

### Tom 214 / 2013

Studia Mathematica 214 (2013), 67-75 MSC: Primary 46B28; Secondary 47L20, 46B50. DOI: 10.4064/sm214-1-4

#### Streszczenie

Given an operator ideal ${\mathcal A}$, we say that a Banach space $X$ has the approximation property with respect to ${\mathcal A}$ if $T$ belongs to $\overline {\{S\circ T: S\in {\mathcal F}(X)\}}^{\tau _c}$ for every Banach space $Y$ and every $T\in {\mathcal A}(Y,X)$, $\tau _c$ being the topology of uniform convergence on compact sets. We present several characterizations of this type of approximation property. It is shown that some of the existing approximation properties in the literature may be included in this setting.

#### Autorzy

Escuela Técnica Superior de Arquitectura
Avenida Reina Mercedes, 2
41012 Sevilla, Spain
e-mail
• Cándido PiñeiroDepartamento de Matemáticas