Find a function such that f'(f(x)) = x.
I found a remarkably cute solution. I don't know if it's unique, and I have no idea how to solve similar problems if we replace x with, say, ln(x), though.
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Find a function such that f'(f(x)) = x.
I found a remarkably cute solution. I don't know if it's unique, and I have no idea how to solve similar problems if we replace x with, say, ln(x), though.