Friday 23 May 2014

proof writing - Proving $mathbb{Z × N}$ is countable.

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

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real analysis - How to find $lim_{hrightarrow 0}frac{sin(ha)}{h}$

How to find $\lim_{h\rightarrow 0}\frac{\sin(ha)}{h}$ without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...