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ihatewonders
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Let K1, K2, K3, . . . be an infnite sequence of sets, where each set Kn is countable.
Prove that the union of all of these sets K = Union from n=1 to infinity, Kn is countable.
I tried to start, but I don't even understand the question
Need some idea on how to start
Prove that the union of all of these sets K = Union from n=1 to infinity, Kn is countable.
I tried to start, but I don't even understand the question
Need some idea on how to start
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