Geodesic
ULTRAPOWERS AND SUBSPACES OF THE DUAL OF A BANACH SPACE
Glasgow mathematical journal, Tome 45 (2003) no. 3, pp. 493-501

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DOI

For a Banach space $X$ we consider three ways in which a subspace of $X^*$ can represent locally the whole dual space $X^*$. We obtain characterizations in terms of ultrapowers and we study the relationship between the subspaces of $X^*$ and the subspaces of the dual of an ultrapower of $X$.
DOI : 10.1017/S001708950300140X
Mots-clés : Primary: 46B08, 46B10, Secondary: 46B04, 46B20 
GONZÁLEZ, MANUEL; MARTÍNEZ-ABEJÓN, ANTONIO. ULTRAPOWERS AND SUBSPACES OF THE DUAL OF A BANACH SPACE. Glasgow mathematical journal, Tome 45 (2003) no. 3, pp. 493-501. doi: 10.1017/S001708950300140X
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