I need to use openright only at front matter. Using
\documentclass[12pt, letterpaper]{book}
\begin{document}
\frontmatter
\chapter{First Chapter at front matter} % This must be page i
\chapter{Second Chapter at front matter} % This must be page iii
\mainmatter
\chapter{First Chapter at main matter} % This must be page 1
\chapter{Second Chapter at main matter} % This must be page 2
\end{document}
I got openright in all document and using
\documentclass[12pt, letterpaper, oneside]{book}
\begin{document}
\frontmatter
\chapter{First Chapter at front matter} % This must be page i
\chapter{Second Chapter at front matter} % This must be page iii
\mainmatter
\chapter{First Chapter at main matter} % This must be page 1
\chapter{Second Chapter at main matter} % This must be page 2
\end{document}
I got openany in all the document.
