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function ln.
* The function h: R -> R⁺, h(x) = x² is not bijective: for instance, h(-1) = h(1) = 1, showing that h is not one-to-one (injective). However, if the domain is restricted to , then h would be bijective; its inverse is the positive square root function.
*By Schröder-Bernstein theorem, given any two sets X and Y, and two injective functions f: X -> Y and g: Y -> X, there exists a bijective

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