#K fx equation series#
I'd like to gather information and references on the following functional equation for power series $$f(f(x))=x+f(x)^2,$$$$f(x)=\sum_$) before they go too far from the origin (after which $u_i$ might not be one-to-one). Vertical hyperbola equation (y k)2 a2 (x h)2 b2 1 ( y - k) 2 a 2 - ( x. For Lp spaces such problems has been investigated in 5, 6, 21, 23 and for.
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