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+\documentclass[a4paper,twoside]{article}
+\usepackage{html}
+\usepackage{amsmath}
+
+\renewcommand{\d}{\partial}\providecommand{\bm}[1]{\mathbf{#1}}
+\providecommand{\Range}{\mathcal{R}}\providecommand{\Ker}{\mathcal{N}}
+\providecommand{\Quat}{\vec{\mathbf{Q}}}
+
+\newcommand{\StAndrews}{\htmlurl{http://www-groups.dcs.st-and.ac.uk/~history}}%
+\newcommand{\Pythagorians}{\htmladdnormallink
+ {Pythagorians}{\StAndrews/Mathematicians/Pythagoras.html}}
+\newcommand{\Fermat}{\htmladdnormallink
+ {Fermat, c.1637}{\StAndrews/HistTopics/Fermat's_last_theorem.html}}
+\newcommand{\Wiles}{\htmladdnormallink
+ {Wiles, 1995}{\htmlurl{http://www.pbs.org:80/wgbh/nova/proof}}}
+
+\begin{document}
+\htmlhead[center]{section}{Math examples}
+\begin{eqnarray}
+ \phi(\lambda) & = &  \frac{1} {2 \pi i}\int^{c+i\infty}_{c-i\infty}
+  \exp \left( u \ln u + \lambda u \right ) du \hspace{1cm}\mbox{for } c \geq 0 \\
+ \lambda       & = &  \frac{\epsilon  -\bar{\epsilon} }{\xi}
+                   - \gamma' - \beta^2 - \ln \frac{\xi} {E_{\rm max}}          \\
+ \gamma        & = &  0.577215\dots \mathrm{\hspace{5mm}(Euler's\ constant)}   \\
+ \gamma'       & = &  0.422784\dots = 1 - \gamma                               \\
+   \epsilon , \bar{\epsilon} & = & \mbox{actual/average energy loss}
+\end{eqnarray}
+
+Since~\eqref{eqn:stress-sr} or~\eqref{gdef} should hold for arbitrary $\delta\bm{c}$%
+-vectors, it is clear that $\Ker(A) = \Range(B)$ and that when $y=B(x)$ one has...\\
+...the \Pythagorians{} knew infinitely many solutions in integers to $a^2+b^2=c^2$. 
+That no non-trivial integer solutions exist for $a^n+b^n=c^n$ with integers $n>2$ has long 
+been suspected (\Fermat). Only during the current decade has this been proved (\Wiles).
+
+\begin{eqnarray}\label{eqn:stress-sr}
+ V \bm{\pi}^{sr} & = & \left<  \sum_i M_i \bm{V}_i \bm{V}_i
+  + \sum_i \sum_{j>i} \bm{R}_{ij} \bm{F}_{ij}\right> \\ \nonumber
+                 & = & \left< \sum_i M_i \bm{V}_i \bm{V}_i
+  + \sum_{i}\sum_{j>i}\sum_\alpha\sum_\beta \bm{r}_{i\alpha j\beta}\bm{f}_{i\alpha j\beta}
+  - \sum_i \sum_\alpha \bm{p}_{i\alpha} \bm{f}_{i\alpha}   \right>
+\end{eqnarray}
+
+\begin{subequations}\label{bgdefs}
+\begin{align} B_{ij}^\alpha     & =
+        \left(B_{ij}^\alpha\right)_0 + \left(B_{ij}^\alpha\right)_a \label{bdef}  \\
+  \left(B_{ij}^\alpha\right)_0  & = \frac{1}{2}\left(\frac{\d N_i^\alpha}{\d X_j}
+        + \frac{\d N_j^\alpha} {\d X_i} \right)                     \label{b0def} \\
+  \left(B_{ij}^\alpha\right)_a  & = H_{ij}^{\alpha \beta} a^\beta   \label{budef} \\
+  H_{ij}^{\alpha \beta}         & = 
+    \frac{1}{2}\left( \frac{\d N_k^\alpha}{\d X_i} \frac{\d N_k^\beta}{\d X_j} 
+    + \frac{\d N_k^\beta}{\d X_i} \frac{\d N_k^\alpha}{\d X_j} \right)  \label{gdef}
+\end{align}
+\end{subequations}
+\end{document}