RT Book, Section T1 On some subsets of the dual of a Banach space. A1 Bombal Gordón, Fernando A2 Bayod Bayod, José Manuel A2 González Ortiz, Manuel A2 Martínez-Maurica, Javier AB With the definition that a Banach space E has the property sDP if the Dunford-Pettis operators and the unconditionally converging operators from E into F coincide for every Banach space F, the author proves that E has property sDP if and only if two specified classes of subsets of the dual space E\sp* of E coincide. He obtains a corresponding characterization of the Dunford-Pettis property of a Banach space E, i.e., that every weakly compact operator from E into F is also a Dunford-Pettis operator for every Banach space F. Additional results about the property sDP and easy proofs of certain known theorems are also given. PB Universidad de Cantabria SN 84-87412-40-8 YR 1991 FD 1991 LK https://hdl.handle.net/20.500.14352/60603 UL https://hdl.handle.net/20.500.14352/60603 DS Docta Complutense RD 10 abr 2025