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7. Consequences of the Hahn-Banach theorems - Aarhus Universitet

7. Consequences of the Hahn-Banach theorems - Aarhus Universitet

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Weak vector space topologies<br />

Pro<strong>of</strong>.<br />

Pro<strong>of</strong> <strong>of</strong> Theorem 3.10. Almost by definition, <strong>the</strong> open sets in<br />

X ′ -topology are <strong>the</strong> sets that are unions <strong>of</strong> sets <strong>of</strong> <strong>the</strong> form<br />

l −1<br />

1 (V1) ∩ l −2<br />

2 (V2) ∩ · · · ∩ l −1<br />

n (Vn),<br />

where each li ∈ X ′ and Vi is an open subset <strong>of</strong> <strong>the</strong> scalars Φ.<br />

Klaus Thomsen <strong>7.</strong> <strong>Consequences</strong> <strong>of</strong> <strong>the</strong> <strong>Hahn</strong>-<strong>Banach</strong> <strong>the</strong>orems

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