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authorJustin Gassner <justin.gassner@mailbox.org>2024-02-14 07:24:38 +0100
committerJustin Gassner <justin.gassner@mailbox.org>2024-02-14 07:24:38 +0100
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title: Banach–Alaoglu Theorem
parent: Functional Analysis Basics
nav_order: 3
-# cspell:words
---
# {{ page.title }}
-{: .theorem-title }
-> {{ page.title }}
-> {: #{{ page.title | slugify }} }
->
-> The closed unit ball in the dual of a normed space is weak\* compact.
+{% theorem * Banach–Alaoglu Theorem %}
+The closed unit ball in the dual of a normed space is weak\* compact.
+{% endtheorem %}
{% proof %}
{% endproof %}
-## Generalization: Alaoglu–Bourbaki
+The {{ page.title }} is a special case of the following result:
+
+{% theorem * Alaoglu–Bourbaki Theorem %}
+The polar of a neighborhood of zero in a locally convex space is weak\* compact.
+{% endtheorem %}
+
+See [Alaoglu–Bourbaki Theorem]({% link pages/more-functional-analysis/locally-convex-spaces/alaoglu-bourbaki-theorem.md %}) for more information.