f( f(x) ) = exp(x) solved ! ! !

[tommy1729]

to construct the taylor series of exp(-x^2), i take the expansion of exp(y) and substitute y = - x^2.

Well thats your choice how you compute the derivatives. But I dont see the connection to the open questions.

open questions ?

surely , you must see f(f(x)) = exp(x) is connected to tetration.

that cannot be denied.

for instance , this lead to numerical data and computable points for tetration-related functions.

regards

tommy1729