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May 4 at 3:22 comment added Claude Leibovici You made my day ! Thanks again and cheers :)
May 4 at 2:20 comment added A. Kato Ok, don't worry. It is my great pleasure if you are satisfied with my revised answer.
May 4 at 2:15 comment added Claude Leibovici Sorry ! It does not work. I I define $g$ as your previous $f$ and $f$ as $g/g'$
May 4 at 2:00 comment added A. Kato Please tell me how, if possible.
May 4 at 1:57 comment added Claude Leibovici Thanksa gain ! Meanwhile, I fixed your previous version
May 4 at 1:55 comment added A. Kato I revised my answer.
May 4 at 1:53 history edited A. Kato CC BY-SA 4.0
revised answer.
May 3 at 15:15 comment added Claude Leibovici I think that we need to define df=D[f,x] and to use ans = Series[x - f /df /. x -> 1/2, {m, Infinity, p}]; But this does not simplify.
May 3 at 14:02 comment added A. Kato @yarchik OK, I might be wrong. I'm so sleepy now. I will temporarily delete my answer and try again, maybe tomorrow. Oops, I cannot delete since it is already accepted....
May 3 at 13:59 comment added yarchik Actually I tried to understand your solution, and I found this relation was confusing. Indeed, $x=x+f(x)$ implies $f(x)=0$, so this is not wrong, but not useful either.
May 3 at 13:34 comment added A. Kato @yarchik Well, I thought of using the recursion like that, too. But I found a solution without using recursion --- just a series expansion around $m=\infty$ was enough. The equation $x_{(m)}=x_{(m)} - f(x_{(m)})$ holds simply because $f(x_{(m)})=0$ by definition.
May 3 at 12:16 comment added yarchik I guess the intention was $x_{m+1}=x_m+f(x_m)$
May 3 at 12:09 comment added A. Kato @yarchik Sorry, I cannot find a typo. Please edit for me.
May 3 at 12:05 comment added yarchik I think there is a typo in the recursive identity.
May 3 at 10:32 comment added Claude Leibovici Thank you ! This is the perfect answer to m'y question
May 3 at 10:30 vote accept Claude Leibovici
May 3 at 10:25 history edited A. Kato CC BY-SA 4.0
added 5 characters in body
May 3 at 10:19 history answered A. Kato CC BY-SA 4.0