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\documentclass{article}
\usepackage{amsmath}

\title{On Diffusion in Sparse Graphs}
\author{R. Mehta}

\begin{document}
\maketitle

\begin{abstract}
We study message propagation on
sparse random graphs and derive a
tighter bound on mixing time.
\end{abstract}

\section{Introduction}
Let $G = (V, E)$ be a sparse graph...

\begin{equation}
  \tau_{\text{mix}} \le c \cdot \log n
\end{equation}
\end{document}