Open Access
2016 Krein-Milman's Extreme Point Theorem and Weak Topology on Hyperspace
Jennifer Shueh-Inn Hu, Thakyin Hu
Taiwanese J. Math. 20(3): 629-638 (2016). DOI: 10.11650/tjm.20.2016.6411
Abstract

Let $\operatorname{WCC}(X)$ be the collection of all non-empty, weakly compact, convex subsets of a Banach space $X$ endowed with the Hausdorff metric $h$. Weak topology $\mathcal{T}_{w}$ will be defined on $\operatorname{WCC}(X)$. We shall prove that every weakly compact ($\mathcal{T}_{w}$-compact) convex subset $\mathcal{K} \subset (\operatorname{WCC}(X), \mathcal{T}_{w})$ has an extreme point. We also show that there exists strongly bounded ($h$-bounded), closed ($h$-closed) convex subsets which are not weakly closed (i.e., not $\mathcal{T}_{w}$-closed).

Copyright © 2016 The Mathematical Society of the Republic of China
Jennifer Shueh-Inn Hu and Thakyin Hu "Krein-Milman's Extreme Point Theorem and Weak Topology on Hyperspace," Taiwanese Journal of Mathematics 20(3), 629-638, (2016). https://doi.org/10.11650/tjm.20.2016.6411
Published: 2016
Vol.20 • No. 3 • 2016
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