Tuesday, 7 October 2014

real analysis - Does a bijective map from $(-pi/2,pi/2)to (0,1)$ exist?





Does a bijective map from $(-\pi/2,\pi/2)\to (0,1)$ exist?




My first guess was using the sine function but it doesn't really comply with the bijective map since it goes from $(-\pi/2,\pi/2)\to (-1,1)$. Am I missing something with the sine function or is there another way I can achieve this bijection?


Answer



Consider the function $f(x) = \frac{x}{\pi} + \frac{1}{2}$.


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