10.04.2013 Views

1. The Baire category theorem - Aarhus Universitet

1. The Baire category theorem - Aarhus Universitet

1. The Baire category theorem - Aarhus Universitet

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

On locally compact Hausdorff spaces<br />

Proof.<br />

It follows that B ⊆ <br />

α∈F Uα, proving that B is compact.<br />

Lemma<br />

Let X be a locally compact Hausdorff space, K a compact subset<br />

of X and U an open subset of X such that K ⊆ U. <strong>The</strong>re is then<br />

an open set V in X with compact closure V such that<br />

K ⊆ V ⊆ V ⊆ U.<br />

Klaus Thomsen <strong>1.</strong> <strong>The</strong> <strong>Baire</strong> <strong>category</strong> <strong>theorem</strong>

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!