Mathematics, 19.09.2019 23:30 alexcuevaz90

Suppose there are denumerably many sets u↵, each of which is countable. (a) true/false? it is possible for the union of all u↵ to be finite. prove or give a counterexample. (b) true/false? the union of all u↵ must be countable. prove or give a counterexample.

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