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\begin{document}


$$
\Delta(z) = q \prod_{n=1}^{\infty} \left( 1 - q^n\right)^{24} = \sum_{n=1}^{\infty} \tau(n) q^n = q - 24q^2 + 252q^3 + \ldots
$$


\vspace{1in}

\begin{center} \leavevmode
\xymatrix{
\fcolorbox{black}{Myblue}{\parbox{4in}{\color{white} $$
\Delta(z) = q \prod_{n=1}^{\infty} \left( 1 - q^n\right)^{24} = \sum_{n=1}^{\infty} \tau(n) q^n = q - 24q^2 + 252q^3 + \ldots
$$  }}  \\
}
\end{center}

\begin{center} \leavevmode
\xymatrix{
\fcolorbox{black}{brown}{\parbox{4in}{\color{white} $$
p(z) = a_nz^n + a_{n-1}z^{n-1} + \ldots + a_1z + a_0
$$
\vspace*{0.2cm}
$$
\lim_{r \rightarrow \infty} \frac{1}{2\pi i} \int_{c(r)} \frac{z p^{\prime}(z) - n p(z)}{zp(z)} \ dz = 0
$$  }}  \\
}
\end{center}

\begin{center} \leavevmode
\xymatrix{
\fcolorbox{black}{Mygreen}{\parbox{4in}{\color{white} 
\begin{eqnarray*}
S^1 & \xrightarrow{\cong} & SO(2,\R) \\
e^{i\theta} & \mapsto & \left( \begin{array}{cc} \cos(\theta) & -\sin(\theta) \\ \sin(\theta) & \cos(\theta) \end{array} \right)
\end{eqnarray*}
  }}  \\
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\newpage
{\bf
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\vspace*{2cm}

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\begin{eqnarray*}
L(s,\chi) & = & \sum_{n=1}^{\infty} \frac{\chi(n)}{n^s} \\
& = & \prod_{p \mbox{ prime}}  \left(1 - \frac{\chi(p)}{p^s} \right)^{-1}
\end{eqnarray*}
  }}  \\
}
\end{center}

\end{document}