Note on operational quantities and Mil'man isometry spectrum
- González Ortiz, Manuel
- Martinón Cejas, Antonio
ISSN: 1130-4723
Ano de publicación: 1991
Volume: 3
Número: 1
Páxinas: 103-111
Tipo: Artigo
Outras publicacións en: Revista de la Academia Canaria de Ciencias: = Folia Canariensis Academiae Scientiarum
Resumo
In this note, using Mil 'man isometry spectrum and some Tsirelson-like examples of Banach spaces, due to Figiel and Johnson, and Schlumprecht, we show that two operational quantities that have been used to characterize upper semi-Fredholm operators, are not equivalent.