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+\documentclass{article}
+\usepackage{mhequ}
+
+\def\eref#1{(\ref{#1})}
+
+\textwidth 13cm
+\textheight 22cm
+\oddsidemargin 0.2cm
+\topmargin 0.3cm
+\pagestyle{empty}
+
+\begin{document}
+
+\section*{Use of "mhequ.sty" (v1.5)}
+\label{mySec}
+A simple labelled equation:
+\begin{equ}[onelab]
+	\sum_{i=1}^5 X_i^j X^j_i = y^j \;.
+\end{equ}
+The name of the label at the right of the equation is generated by
+the \texttt{draft} option of the package. Without label, one gets
+the same:
+\begin{equ}
+	\sum_{i=1}^5 X_i^j X^j_i = y^j \;.
+\end{equ}
+A simple list of equations can be displayed either with one number
+per equation
+\begin{equs}
+	f(x) &= \sin(x) + 1\;, \label{e:equ1}\\
+	h(x) &= f(x) + g(x) -3\;, \label{e:equ3}
+\end{equs}
+or with one number for the whole list
+\begin{equa}[e:block]
+	f(x) &= \sin(x) + 1\;, \\
+	h(x) &= f(x) + g(x) -3\;.
+\end{equa}
+Of course, it can have no numbering at all.
+\begin{equs}
+	f(x) &= \sin(x) + 1\;, \\
+	h(x) &= f(x) + g(x) -3\;,
+\end{equs}
+Let us make a first group:
+\minilab{otherlabel}
+\begin{equs}
+	f(x) &= \sin(x) + 1\;, \label{e:f}\\
+	g(x) &= \cos(x) - x^2 + 4\;,\label{e:g}\\[3mm]
+	h(x) &= f(x) + g(x) -3\;. \label{e:h}
+\end{equs}
+You can refer to the whole block \eref{otherlabel} or to one
+line, like \eref{e:f} for example. 
+You can use any tag you like with the \texttt{\string\tag}
+command
+\begin{equ}[mylabel]
+	 x = y\;. \tag{tag}
+\end{equ}
+Of course, you can also refer to \eref{mylabel}.
+You can use the usual \texttt{equation} environment, but it will not
+display its label.
+\begin{equation}
+ x=y+z
+\end{equation}
+If you want to typeset several columns of equations, it is quite easy:
+\begin{equs}[3]
+	x&=y+z    &\qquad   a&= b+c     &\qquad x&= v \label{laba}\\
+	x&=y+z    &\qquad   a&= b+c     &\qquad x&= u+1\tag{\ref{laba}'}\label{labtag}\\
+	\multicol{4}{\text{(multicol)}}   &\qquad x&=y     \\
+	a&= b     &\multicol{4}{\qquad\text{(multicol)}} \\
+	x&=y+z    &\qquad a^2&= (b-c)^3 +y \\
+\intertext{and also (this is some \texttt{\string\intertext})}
+	x&=y+z    &\qquad   a&= (b+c)^2 - 5 &\qquad \ell&= m\label{labb}
+\end{equs}
+You can even extend the block \eref{otherlabel} much later like
+\minilab{otherlabel}
+\begin{equs}[3]
+	x&=y+z &\quad x&=y+z  &\quad f(x)&= b\label{e:x1}\\
+	x&=y+z & x&=y+z &\quad g(x)&= b\label{e:x2} \\
+	\multicol{6}{\sin^2 x + \cos^2 x = 1} \label{e:x3}
+\end{equs}
+You can also change the type of the subnumbering and use the 
+\texttt{\string\text} command without loading \texttt{amstext}. Like for example
+\setlabtype{Alph}
+\minilab{alab}
+\begin{equs}[2]
+	I_1 &= \int_a^b g(x)\,dx\;,&\quad&\text{(First equation)} \label{e:1}\\
+	I_2 &= \int_a^b g(x^2-1)\,dx\;.&\quad&\text{(Second equation)} \label{e:2}
+\end{equs}
+
+\end{document}
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