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+% Bookdown LaTeX header file
+
+% Inclusion of external PDF documents (such as a cover image)
+% See https://www.ctan.org/pkg/pdfpages
+\usepackage{pdfpages}
+
+% To properly handle URLs in bibliographies
+% See https://tex.stackexchange.com/questions/484176/biblatex-overflowing-url
+\usepackage{xurl}
+
+% PDF bookmarks
+% See https://ctan.org/pkg/bookmark
+%     https://texdoc.org/serve/bookmark.pdf/0
+\usepackage[depth=2]{bookmark}
+
+% Indexing
+% See https://en.wikibooks.org/wiki/LaTeX/Indexing
+%     https://www.ctan.org/pkg/makeidx
+%     https://bookdown.org/yihui/bookdown/latex-index.html
+%\usepackage{imakeidx}
+\usepackage{makeidx}
+\makeindex
+
+% No matter what is said in the docs, this was required
+% But maybe because tufte::tufte_book was being used instead of bookdown::tufte_book2
+% So perhaps this is not needed anymore
+% See https://bookdown.org/yihui/bookdown/markdown-extensions-by-bookdown.html#theorems
+%     https://ctan.math.illinois.edu/macros/latex/contrib/thmtools/doc/thmtools-manual.pdf
+\usepackage{amsthm,thmtools}
+
+% Bookdown docs recommends to not mess with this
+% See https://bookdown.org/yihui/bookdown/markdown-extensions-by-bookdown.html#theorems
+%\newtheorem{definition}{Definição}[chapter]
+%\newtheorem{hiphotesis}{Hipótese}[chapter]
+%\newtheorem{conjecture}{Conjectura}[chapter]
+%\newtheorem{demonstration}{Demonstração}[chapter]
+%\newtheorem{etimology}{Etimologia}[chapter]
+
+% Fix positions of margin notes
+% See https://ctan.org/pkg/marginfix
+%     https://tex.stackexchange.com/questions/119726/horizontal-margins-for-margin-notes-in-the-tufte-classes
+%     https://tex.stackexchange.com/questions/624033/long-sidenotes-break-marginfix-or-how-to-make-breakable-sidenotes
+\usepackage{marginfix}
+
+% Workaround to theorems work correctly
+% Maybe this is not needed anymore
+% See https://stackoverflow.com/questions/46942352/r-bookdown-document-with-theorem-does-not-render-when-output-file-is-specified
+\let\BeginKnitrBlock\begin \let\EndKnitrBlock\end
+
+% Set page size
+%
+% This command conflicts with something and gives an error
+%\usepackage[paperwidth=6in, paperheight=9in]{geometry}
+%
+% This command needs tuning for the margins
+%\newgeometry{paperwidth=6in, paperheight=9in}
+%
+% This also needs tuning
+% See https://tex.stackexchange.com/questions/201893/change-paper-size-in-tufte-book-class#380699
+%\newgeometry{
+%  % showframe,
+%  paperwidth=6in,
+%  paperheight=9in,
+%  left=0.55in,
+%  right=0.45in,
+%  top=.5in,
+%  bottom=.5in,
+%  marginparsep=0.25in,
+%  marginparwidth=0.65in,
+%  includemp,
+%  includehead,
+%  % The text width and height are calculated automatically.
+%}
+%
+% This should work, but we're setting this at 00-header.md
+%\newgeometry{b5paper}
+
+% Coverpage and copyright notice before title in R bookdown
+% See https://stackoverflow.com/questions/45963505/coverpage-and-copyright-notice-before-title-in-r-bookdown
+\let\oldmaketitle\maketitle
+\AtBeginDocument{\let\maketitle\relax}
+
+% Custom header
+\IfFileExists{snippets/header.tex}{\input{snippets/header.tex}}{}