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# 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.

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This is a proof regarding countable sets.

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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| ...

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