\documentclass[10pt]{article}

\usepackage{amsmath,amssymb}
\usepackage[mathscr]{eucal}
\usepackage{eufrak}
\usepackage[papersize={133pt,100pt},margin=0.5pt]{geometry}
\usepackage{color}
\usepackage{etoolbox}
\setlength{\parindent}{0pt}
\pagestyle{empty}

\newcommand{\blue}[1]{\textcolor{blue}{#1}}

\DeclareRobustCommand{\KaTeX}{\mbox{%
K\kern-.26em%
{\sbox0 T\vbox to\ht0{\kern.05em\hbox%
  {\fontsize{.75em}{1em}\selectfont A}%
\vss}}%
\kern-.23em%
\TeX}}

% Thanks to http://tex.stackexchange.com/a/26017/16923
\newtoks\kasizetoks
\def\kasizecollect#1{\afterassignment\kasizeapply\kasizetoks=\bgroup#1$}
\def\kasizeapply{\mbox{\the\kasizetoks$\egroup}}
\def\kasize#1{\csletcs{ka#1}{#1}%
\csdef{#1}{\ifmmode\expandafter\kasizecollect\csname ka#1\endcsname%
\else\csname ka#1\endcsname\fi}}
\kasize{tiny}
\kasize{scriptsize}
\kasize{footnotesize}
\kasize{small}
\kasize{normalsize}
\kasize{large}
\kasize{Large}
\kasize{LARGE}
\kasize{huge}
\kasize{Huge}

\begin{document}
$...$
\end{document}