|N|=|N×N| (N×N countable)
I tried to build a bijective function f(n,m)→n. I saw some posts about this question but there wasn't any example nor a good explanation.
How to find limh→0sin(ha)h without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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