Re: " f^ [n](x) = exp( n/ phi' (x) D ) o x "

In article <1146730482.691252.6670@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
<"alainverghote@xxxxxxxx"> wrote:

Any Idea ?

Thanx , Alain


Perhaps if you write it very carefully, so that it makes sense, there
would be something to say. In particular, state precisely what D is
and what x is. Maybe write it down in the particular case
f(x) = 2x, phi(x)=log_2(x). I have a feeling it is a version
of the formula exp(aD)(g)(x) = g(x+a) which is a symbolic
way of writing the Taylor series.

--
G. A. Edgar http://www.math.ohio-state.edu/~edgar/
.

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