f(f(x)) = x² - x + 1
f(0) = ?
(@edsaperia inflicted this on me earlier :P )
@undefdev linked me to this paper earlier today, and I don't fully understand the limits of its implications(I think just for complex plain)
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(plain/planes. I think real functions are safe, but I don't know a paper for that)
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Since real functions are a subset of complex functions, I think the result of the paper applies here
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