" f^ [n](x) = exp( n/ phi' (x) D ) o x "
- From: "alainverghote@xxxxxxxx" <alainverghote@xxxxxxxx>
- Date: 2 May 2006 10:35:20 -0700
Dear friends ,
I've met this formula a long time ago I don't remember
when and where .
Do you know anything about it ,
n is a positive integer , [n] means n th iterate of function f,
phi'(x) the derivative of Abel function phi(x) which
satisfies : phi(f^ [n](x) ) = phi(x) +n , D stands for d/dx ,
and exp( n/ phi' (x) D ) is a differential operator ,
Merci , Alain
.
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