deletions | additions       diff --git a/header.tex b/header.tex  index 7e89902..e6d4138 100644  --- a/header.tex  +++ b/header.tex 
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\usepackage{subfigure}  \usepackage{amssymb, amsmath, amsfonts}  \usepackage{amsthm}  \usepackage{tikz}  \usetikzlibrary{matrix,fit,external,arrows}  \usepackage{pgfplots}  \newtheorem{proposition}{Proposition}  \newtheorem{theorem}{Theorem}  \newtheorem{definition}{Definition} 
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\newtheorem{assumption}{Assumption}  \newtheorem{step}{Step}  \newlength\figureheight  \newlength\figurewidth  \DeclareMathOperator*{\argmin}{arg\; min} % argmin  \DeclareMathOperator*{\argmax}{arg\; max} % argmax  \DeclareMathOperator*{\tr}{tr} % trace