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+\documentclass{ppex}
+\nonstopmode
+\usepackage {mathptm}
+\pagestyle{empty}
+
+\begin{document}
+\ResetPreambleCommands
+\ReadyForTheFray
+\usepackage {mathptm}
+The default math mode font is $math\ italic$. This should not be
+confused with ordinary \emph{text italic}.
+\verb|\mathbf| produces $\mathbf{bold-face\ roman}$ letters.
+Greek is available in upper and lower case:
+\(\alpha,\beta, \Gamma, \Delta \dots \omega, \Omega\)
+There is also a calligraphic font for upper-case letters;
+these are produced by the \verb|\mathcal| command:
+\( \mathcal{ABCDE} \)
+
+
+\begin{equation}
+  \phi(t)=\frac{1}{\sqrt{2\pi}}
+  \int^t_0 e^{-x^2/2} dx
+\end{equation}
+
+\begin{equation}
+  \prod_{j\geq 0}
+  \left(\sum_{k\geq 0}a_{jk} z^k\right)
+= \sum_{k\geq 0} z^n
+  \left( \sum_{{k_0,k_1,\ldots\geq 0}
+          \atop{k_0+k_1+\ldots=n}    }
+        a{_0k_0}a_{1k_1}\ldots  \right)
+\end{equation}
+
+\begin{equation}
+\pi(n) = \sum_{m=2}^{n}
+  \left\lfloor \left(\sum_{k=1}^{m-1}
+       \lfloor(m/k)/\lceil m/k\rceil
+       \rfloor \right)^{-1}
+  \right\rfloor
+\end{equation}
+
+\begin{equation}
+\{\underbrace{%
+    \overbrace{\mathstrut a,\ldots,a}^{k\ a's},
+    \overbrace{\mathstrut b,\ldots,b}^{l\ b's}}
+  _{k+1\ \mathrm{elements}}                   \}
+\end{equation}
+\end{document}