Real analysis - countable
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Proof:
if A subset or equal of B and B is countable, then A is either countable, finite or empty.
https://brainmass.com/math/real-analysis/real-analysis-countable-25356
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proof:
Since A is a subset of B or equal to B, then |A|<=|B|, where |.| means the number of elements in a set. Since B is countable, then |B| ...
Solution Summary
This is a proof regarding countable sets.
$2.49