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Abstract and Applied Analysis
Volume 2009, Article ID 780287, 6 pages
Research Article

The Tsirelson Space Has a Unique Unconditional Basis up to Permutation for

Departamento de Matemáticas, Universidad Pública de Navarra, Pamplona 31006, Spain

Received 16 July 2009; Accepted 3 December 2009

Academic Editor: Simeon Reich

Copyright © 2009 F. Albiac and C. Leránoz. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We show that the -convexified Tsirelson space for and all its complemented subspaces with unconditional basis have unique unconditional basis up to permutation. The techniques involved in the proof are different from the methods that have been used in all the other uniqueness results in the nonlocally convex setting.