Question #6c402
1 Answer
Dec 31, 2016
The set is countable (countably infinite) and unbounded.
Explanation:
The rationals are countable.
The set of ordered pairs of elements of a countable set is countable. (More generally, the Cartesian product of two countable sets is countable.) (Use a proof analogous to the proof that the rationals are countable.)
So, the ordered pairs of rationals are countable.
So,