Monday 17 April 2017

elementary set theory - construct a bijection between $(0,1)$ to $R/N$

Suppose $A = (0, 1)$ and $B = R/N$. Then how to construct a bijection from $A$ to $B$? i am aware of bijections from $(0,1)$ to $R$. a hint would be helpful here. where $R$ are real numbers and $N$ are natural numbers and $R/N$ is the set of reals without natural numbers

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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}...