Note on operational quantities and Mil'man isometry spectrum

Autores: Manuel González Ortiz , Antonio Martinón Cejas
Localización: Revista de la Academia Canaria de Ciencias: = Folia Canariensis Academiae Scientiarum, ISSN 1130-4723, Vol. 3, Nº. 1, 1991, págs. 103-111
Idioma: inglés
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Resumen
- 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.