Ah, I was taking So8res to be talking about how, for any infinite subset of the natural numbers, there are bijections between that set and the natural numbers, but your interpretation (bijections between the natural numbers and the set of finite subsets of the natural numbers) makes much more sense. Retracted; thanks.
Ah, I was taking So8res to be talking about how, for any infinite subset of the natural numbers, there are bijections between that set and the natural numbers, but your interpretation (bijections between the natural numbers and the set of finite subsets of the natural numbers) makes much more sense. Retracted; thanks.