\documentclass{article}
\usepackage{amsmath} % pkg required by EasyLatex
\usepackage{amsfonts} % pkg required by EasyLatex
\usepackage{amssymb} % pkg required by EasyLatex
\usepackage{psfrag} % pkg required by EasyLatex
\usepackage[dvips]{graphicx} % pkg required by EasyLatex

\begin{document}

\begin{align*}x \mapsto y 
\\ \\ \\ \frac{1}{3} 
\\ \\ \\  1 + 1 &= 2
\\1 &\leq 3 - 1
\\&\leq 5
\end{align*}

\end{document}