Mathematics, 17.10.2019 21:00 cearacrank

5. (a) suppose that a is countable. prove that if f : a + b is onto, then b is also countable. (b) prove the union of any two countably infinite sets is countably infinite. (c) prove the set of irrational numbers is uncountable.

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5. (a) suppose that a is countable. prove that if f : a + b is onto, then b is also countable. (b)...

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