deletions | additions       diff --git a/header.tex b/header.tex  index 03a51ba..8dd2b3f 100644  --- a/header.tex  +++ b/header.tex 
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\usepackage{latexml,lxRDFa}  \def\onlyHTML#1{\iflatexml#1\fi}  \def\onlyPDF#1{\iflatexml\else#1\fi} \newtheorem{theorem}{Theorem}  \newtheorem{proof}{Proof}