mathsub.com on Twitter: "Compact sets can be tough to imagine, but in Euclidean space, the Heine-Borel Theorem helps a lot! #MathGRE #Analysis https://t.co/enMHYJYfyt" / Twitter
Chapter 3 The Real Numbers. - ppt download
An Analysis of the First Proofs of the Heine-Borel Theorem - History | Mathematical Association of America