International Journal of Mathematics and Mathematical Sciences
Volume 2005 (2005), Issue 16, Pages 2533-2545

Double-dual types over the Banach space C(K)

Markus Pomper

Department of Mathematics, Indiana University East, Richmond 47374, IN, USA

Received 27 February 2005; Revised 5 July 2005

Copyright © 2005 Markus Pomper. 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.


Let K be a compact Hausdorff space and C(K) the Banach space of all real-valued continuous functions on K, with the sup-norm. Types over C(K) (in the sense of Krivine and Maurey) can be uniquely represented by pairs (,u) of bounded real-valued functions on K, where is lower semicontinuous, u is upper semicontinuous, u, and (x)=u(x) for all isolated points x of K. A condition that characterizes the pairs (,u) that represent double-dual types over C(K) is given.