I my book, it says: To prove that a set is denumerable you should find a bijection .
Now, I need to prove that is denumerable.
So I replace my with in the previous paragraph. Now I need to find a bijection .
Would it be equivalent to find a bijection ?
If so, I need to find a function that takes the rational numbers to . Also, it need to be injective.
It should be suffiecient to find a bijection ?
What could look like?