- Mathematics
- Calculus and Analysis
- Real Analysis
- 25452

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1- if A1,A2,A3,...,Am are each countable sets, then the union A1 U A2 U A3...U Am is countable

2- if An is a countable set for each n belong to N,then Un=1(to infinity) An is countable

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https://brainmass.com/math/real-analysis/real-analysis-25452
This is a proof regarding countability of sets.

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