Can you show that both sets have the same cardinality as [0,1]?
Hi there,
I have a question to solve: if a<b and c<d for , where a,b,c and d are all rationals, how do I prove that [a,b] and [c,d] have the same cardinality.
I know that we're supposed to show bijection between the sets, but I don't know how I would start. Any help please?