{1, 4, 9, 16, 25, . . .} An infinite set is said to be countably infinite

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{1, 4, 9, 16, 25, . . .}


An infinite set is said to be countably infinite if it can be placed into a one-to-one correspondence with the set of counting numbers, N. If the set cannot be placed into such a correspondence, it is said to be uncountably infinite. Decide whether the sets in Problems 49–54 are countably infinite.

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