f(f(x)) = x² - x + 1
f(0) = ?
(@edsaperia inflicted this on me earlier :P )
f(f(x)) x² - x + 1 isn't invertible ( http://www.wolframalpha.com/input/?i=x ²+-+x+%2B+1 ) so f can't be invertible
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f(f(x)) x² - x + 1 isn't invertible ( http://www.wolframalpha.com/input/?i=x ²+-+x+%2B+1 ) so f can't be invertible