[Tex/LaTex] Oneside cover within a twosided LaTeX document

coversmargins

I'm writing my thesis and I'd like to have a onesided cover while the rest of the document is twoside, so to obtain the text and figures well-centered within the cover. Here is my main .tex file:

\documentclass[11pt,a4paper,twoside,onecolumn,openany]{book}
\usepackage{thesis}
\graphicspath{{plots/}}
\begin{document}

%\setboolean{@oneside}{false}
\include{cover/cover}
%\setboolean{@oneside}{true} 

\include{chapter1\chapter}
...

Furthermore, the default margins are too big, and so I'd like to change them. A first solution to this last problem was to change the document into a twocolumn one in the very first line of the code, and then, after the cover page, changing it into \onecolumn.

EDIT: my own answer (see below) doesn't give the exact result I wanted. Now the number of the pages are correctly put on opposite corners depending whether it's an odd or even page, but the left and right margins are the same. Actually, I would like "external" margins to be a little wider, to put there some notes (using \marginpar).

Thanks!

Best Answer

After trying all the possible permutations of the commands I know, I obtained a good result with the code below:

\documentclass[11pt,a4paper,oneside,twocolumn,openany]{book}

\usepackage{thesis}
\graphicspath{{plots/}}

\begin{document}

    \include{cover/cover}

    %change into onecolumn-twoside
    \onecolumn
    \setboolean{@twoside}{true}

    \mainpagestyle

    \include{chapter1/chapter}
    \include{chapter2/chapter}
    \include{chapter3/chapter}

    \backmatter
    \twocolumn

    \addcontentsline{toc}{chapter}{References}
    \bibliographystyle{siam}
    \bibliography{mybib.bib}

\end{document}
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