\documentclass[12pt]{article}
\usepackage{amsfonts}
 
\voffset=-3.0cm
\hoffset=-2.6cm
\textwidth=17.5cm
\textheight=24cm

\renewcommand{\not}{\neg}
\newcommand{\aand}{\wedge}
\newcommand{\oor}{\vee}
\newcommand{\impl}{\Rightarrow}
\newcommand{\lequiv}{\Leftrightarrow} %equivalence as logical connective
\newcommand{\all}{\forall}
\newcommand{\exi}{\exists}
\newcommand{\elc}{\models}  % semantic logical consequence
\newcommand{\ylc}{\vdash}  % syntactic logical consequence
%\equiv is already defined for === semantic equivalence
\newcommand{\union}{\cup}
\newcommand{\intersect}{\cap}
\newcommand{\true}{{\mathbb{T}}}
\newcommand{\false}{{\mathbb{F}}}


\pagestyle{empty}

\begin{document}

{\bf Automated Reasoning, WS 2015.
Homework 4, given Nov 11, due Nov 17.}

\bigskip

\bigskip

\noindent

From the book by Chang and Lee:

page 69, ex. 13, 14;

page 98, ex. 6 (1, 3, 5);

page 99, ex. 12, 13.

\end{document}
