Re: i apologize : of course f '' (x) = / = 0.



On 27 Feb, 16:13, tommy1729 <tommy1...@xxxxxxxxx> wrote:
tommy1729 <tommy1...@xxxxxxxxx> wrote:
hi all

let f(x) be an analytic function  mapping all
rationals to rationals (
and all reals to reals ).

i apologize : of course f '' (x) = / = 0.
is what i meant.

So try f(x) = x^2
and f''(x) = 2
.