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Title:
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Determinacy and Weakly Ramsey sets in Banach spaces
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Author:
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Bagaria, Joan; López Abad, Jordi
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Other authors:
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Universitat de Barcelona |
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Abstract:
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We give a sufficient condition for a set of block subspaces in an infinite-dimensional Banach space to be weakly Ramsey. Using this condition we prove that in the Levy-collapse of a Mahlo cardinal, every projective set is weakly Ramsey. This, together with a construction of W. H. Woodin, is used to show that the Axiom of Projective Determinacy implies that every projective set is weakly Ramsey. In the case of co we prove similar results for a stronger Ramsey property. And for hereditarily indecomposable spaces we show that the Axiom of Determinacy plus the Axiom of Dependent Choices imply that every set is weakly Ramsey. These results are the generalizations to the class of projective sets of some theorems from W. T. Gowers, and our paper "Weakly Ramsey sets in Banach spaces." |
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Subject(s):
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-Teoria de conjunts
-Espais de Banach
-Applications of set theory
-Descriptive set theory
-Sequence spaces |
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Rights:
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(c) American Mathematical Society, 2002
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Document type:
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Article
Article - Published version |
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Published by:
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American Mathematical Society
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