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Thank you, I was too tired lol

Here is my code and what I have, and I don't understand why my text "n+1 itérations" isn't centered under the underbrace

Thanks a lot for your time Mister, really.

Isak Y.

Oh perfect it works, last little issue, now I have the line in the header also on chapter and part pages like that :
And it annoys a bit, if it's possible to erase it

Thank you so much,
Isak Y.

Once compiled i got this.

Here there is all my code if it can help understanding my issues..

Sorry I'm a beginner, so what should I write in each part to have it "manually" when I write \part{Algebra} for example what should I write next ?

Also, I have another question, on each page instead of having the number of the page I want to have - [number page] - with the two "-" on each side of ...

I added this to my main.tex and this is what I got, many errors :

Let's goooo, finally.. I've been chating with a lot of users and nobody found a solution...

Thank you a lot Mister, I have a last question on my book, I've parts, chapters and in my headings I have on the left "Part [with the number of this part]" thanks to \thepart and on the right "Chapter ...

Thank you for your answer. But the thing is that I started using "oneside" to not have the white pages before the next chapters (because i think it starts the chapters on odd pages ...) and with twoside=semi i still have this issue..
If you have an idea maybe to solve this problem ;)

Thanks,
Isak ...