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Date: 16-4-2019
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Date: 29-7-2019
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Date: 19-7-2019
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Every bounded infinite set in has an accumulation point.
For , an infinite subset of a closed bounded set
has an accumulation point in
. For instance, given a bounded sequence
, with
for all
, it must have a monotonic subsequence
. The subsequence
must converge because it is monotonic and bounded. Because
is closed, it contains the limit of
.
The Bolzano-Weierstrass theorem is closely related to the Heine-Borel theorem and Cantor's intersection theorem, each of which can be easily derived from either of the other two
Portions of this entry contributed by Todd Rowland
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