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International Journal of Mathematics and Mathematical Sciences
Volume 2005, Issue 17, Pages 2749-2756

The Kreps-Yan theorem for L

Faculty of Mechanics and Mathematics, Rostov State University, 5 Zorge Street, Rostov-on-Don 344090, Russia

Received 1 January 2005; Revised 11 June 2005

Copyright © 2005 Hindawi Publishing Corporation. 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 prove the following version of the Kreps-Yan theorem. For any norm-closed convex cone CL such that CL+={0} and CL+, there exists a strictly positive continuous linear functional, whose restriction on C is nonpositive. The technique of the proof differs from the usual approach, applicable to a weakly Lindelöf Banach space.