When are to functions y(adsbygoogle = window.adsbygoogle || []).push({}); _{1}= f_{1}(x) and y_{2}= f_{2}(x) independent? It would apper never, because, we can always write x = f_{1}^{-1}(y_{1}), and therefore y2 is a function of y1. Every function is dependent of any other function. Generally, dy_{1}/dy_{2}!= 0 for arbitrary functions y_{1}and y_{2}. Is this reasoning correct?

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# Independence of two functions

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