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Topic: Compactification
Replies: 15   Last Post: Mar 17, 2013 6:11 AM

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William Elliot

Posts: 2,637
Registered: 1/8/12
Posted: Dec 11, 2012 11:13 PM
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(h,Y is a (Hausdorff) compactification of X when h:X -> Y is an embedding,
Y is a compact (Hausdorff) space and h(X) is a dense subset of Y.

Why the extra luggage of the embedding for the definition of
compactification? Why isn't the definition simply
Y is a compactification of X when there's some
embedding h:X -> Y for which h(X) is a dense subset of Y?

I see no advantage to the first definition. The second definition
has the advantage of being simpler and more intuitive. So why is
it that the first is used in preference to the second which I've
seen used only in regards to one point compactifications?

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