I have a question regarding different functions. Suppose we have two functions ##f## and ##f'## with same domain, but different codomains.(adsbygoogle = window.adsbygoogle || []).push({});

Consider that ##f': x' \mapsto f'(x')## and ##f: x \mapsto f(x)##. If ##x' = x + \sigma##, with ##|\sigma| << 1##, can we say that ##f'(x') \approx f(x')##?

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# I Approximating different functions

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