Your current preamble. Use ,texconfig to see the other LaTeX config options!
Your personal custom preamble.
\newtheorem{Theorem}{Theorem}
\newtheorem{Proposition}{Theorem}
\newtheorem{Lemma}[Theorem]{Lemma}
\newtheorem{Corollary}[Theorem]{Corollary}
\theoremstyle{definition}
\newtheorem{Definition}[Theorem]{Definition}
\renewcommand{\div}{\divisionsymbol}
\usepackage{upgreek}
\usepackage{lmodern} \usepackage{sfmath}
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rocky plinth