posted on 2025-05-08, 14:23authored byJonathan M. Borwein
A self-contained and brief proof is given of the equivalence of the Hahn-Banach extension property (HB) and the conditional order completeness of the range space (LUB). Various other equivalences are discussed.
First published in Proceedings of the American Mathematical Society in Vol. 86, No. 1, pp. 42-46, 1982, published by the American Mathematical Society.