I am studying Heine-Borel theorem.(adsbygoogle = window.adsbygoogle || []).push({});

I finally get the sense of this theorem after i read a lots posts here.

But I found a question posted by Rach3

why for S={1,1/2,1/3……} there is no subcollection of it is a cover of S

but every open cover of T={0,1,1/2,1/3……} has a finite subcover?

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# Help,about subcover!

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