\documentclass{article} \begin{document} \begin{equation} \frac{\partial Q}{\partial t} = \frac{\partial s}{\partial t} \end{equation} \end{document}

\begin{equation} \frac{\partial h}{\partial t} + \frac{\partial uh}{\partial x} + \frac{\partial vh}{\partial y} = 0 \end{equation}

- equation with numbering

\begin{equation} \frac{\partial h}{\partial t} + \frac{\partial uh}{\partial x} + \frac{\partial vh}{\partial y} = 0 \end{equation}

- equation with name no numbering

\usepackage{amsmath}% http://ctan.org/pkg/amsmath \newcommand{\eqname}[1]{\tag*{#1}}% Tag equation with name \begin{document} \begin{equation} \frac{\partial h}{\partial t} + \frac{\partial uh}{\partial x} + \frac{\partial vh}{\partial y} = 0 \eqname{Continuity Equation} \ \end{equation} \end{document}

- equation with both name and numbering

\usepackage{amsmath}% http://ctan.org/pkg/amsmath \newcommand{\eqname}[1]{\tag*{#1}}% Tag equation with name \begin{document} \begin{align} \frac{\partial h}{\partial t} + \frac{\partial uh}{\partial x} + \frac{\partial vh}{\partial y} = 0 \\ \eqname{Continuity Equation} \ \end{align} \end{document}

- equation with both name and numbering and ref equation in text body

\documentclass{article} \usepackage{amsmath}% http://ctan.org/pkg/amsmath \newcommand{\eqname}[1]{\tag*{#1}}% Tag equation with name \begin{document} \begin{align} f(x) &= a \\ \eqname{Constant} \ g(x) &= ax \\ \eqname{Linear} \ h(x) &= ax^2+bx+c \label{abc} \\ \eqname{Quadratic} \end{align} See~\eqref{abc}. \end{document}