\documentclass[11pt]{amsart}
\usepackage{geometry}                % See geometry.pdf to learn the layout options. There are lots.
\geometry{letterpaper}                   % ... or a4paper or a5paper or ... 
%\geometry{landscape}                % Activate for for rotated page geometry
%\usepackage[parfill]{parskip}    % Activate to begin paragraphs with an empty line rather than an indent
\usepackage{graphicx}
\usepackage{amssymb}
\usepackage{epstopdf}
\DeclareGraphicsRule{.tif}{png}{.png}{`convert #1 `dirname #1`/`basename #1 .tif`.png}

% From http://tex.stackexchange.com/questions/20740/symbols-for-outer-joins
\def\ojoin{\setbox0=\hbox{$\bowtie$}%
  \rule[-.02ex]{.25em}{.4pt}\llap{\rule[\ht0]{.25em}{.4pt}}}
\def\leftouterjoin{\mathbin{\ojoin\mkern-5.8mu\bowtie}}
\def\rightouterjoin{\mathbin{\bowtie\mkern-5.8mu\ojoin}}
\def\fullouterjoin{\mathbin{\ojoin\mkern-5.8mu\bowtie\mkern-5.8mu\ojoin}}


\title{Homework 1}
\date{}                                           % Activate to display a given date or no date

\begin{document}
\maketitle

\section*{Instructions}

Due on Friday, Sep. 11, 2015, at class time (2:30PM)

You must submit this assignment electronically, via Blackboard, as a PDF.

Some \LaTeX commands that you may find useful:

\begin{itemize}

\item{Basic Relational Algebra Operators ($\sigma, \Pi, \times, \cup, -, \rho$)}
\item{Additional RA Operators ($\bowtie, \cap, \fullouterjoin, G$)}

\item{Rename operation from class:

 $\Pi_{Name}(Monster) -
\Pi_{Monster.Name}(\sigma_{Monster.Level < X.Level}(Monster \times \rho_{X}(Monster)))$}

\item{Aggregation operation from class:

$_{Class} \mathcal{G}_{MEAN(FLOOR (XP / 25 + 1))}(Characters)$}

\end{itemize}

\section*{Questions}

\begin{enumerate}

\item{Ch.2, problem 2.9}

\item{Ch.2, problem 2.12}

\item{Ch.6, problem 6.4}

\item{Ch.6, problem 6.12}

\end{enumerate}


\end{document}  