Friday, 23 May 2014

proof writing - Proving mathbbZ×N is countable.

How would I prove that Z×N is countable? The hint given was to follow to indicated order. Thanks!

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real analysis - How to find limhrightarrow0fracsin(ha)h

How to find lim without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...