Though we went over it in class the proof to find that the subset of a denumerable set is denumerable. I just need to read it a little more carefully.
I found it very interesting that the set of all rational numbers is denumerable but I suppose it makes sense considering it is a relation on the integers and that is a subset of the cartesian product of the integers, which is denumerable and a subset of a denumerable set is denumerable. It seems this denumerable thing is starting to make a lot more sense.
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