APEX_format.sty

%%%

%%%%
%% Begins the usepackage section
%%%%

\RequirePackage{amsmath}
\RequirePackage{amssymb}
\RequirePackage{amsthm}

\RequirePackage{ifthen}

\RequirePackage{layout}
\RequirePackage{graphicx}
\RequirePackage{multicol}
\RequirePackage{tikz}
\usetikzlibrary{calc}
\RequirePackage{makeidx}
\RequirePackage[noplaybutton]{media9}

\RequirePackage{changepage}
\RequirePackage{ulem}
\RequirePackage{xcolor}
\RequirePackage[bookmarksnumbered,hidelinks,pdfstartview=FitH]{hyperref}
%linkbordercolor=white
%\RequirePackage{fancyhdr}
\RequirePackage{calc}
\RequirePackage{enumitem}
\RequirePackage[h]{esvect}



\makeindex

\newcommand{\apex}{A\kern -1pt \lower -2pt\hbox{P}\kern -4pt \lower .7ex\hbox{E}\kern -1pt X}


%%%%
%% The portions of the header containing fancyheader commands
%% has been moved to a book specific location and is not considered
%% part of the APEX header. This may change.
%%%%

%%%%
%%  Create boolean for whether or not to print 3D graphics. 
%%  Also creates command to switch back and forth; "looks better."
%%%%
\newboolean{in_threeD}
\setboolean{in_threeD}{true}
\newcommand{\usethreeDgraphics}{\setboolean{in_threeD}{true}}
\newcommand{\usetwoDgraphics}{\setboolean{in_threeD}{false}}

%%%%
%% Commands to determine whether we print in color or 
%% black and white
%%%%
\newboolean{in_color}
\setboolean{in_color}{true}

% determines the line colors for color and black and white lines.
\newcommand{\colorlinecolor}{blue!95!black!30}
\newcommand{\bwlinecolor}{black!30}

% sets the line color to be in color, as a default
\newcommand{\thelinecolor}{\colorlinecolor}

\newcommand{\setcolorlinecolor}[1]{\renewcommand{\colorlinecolor}{#1}\renewcommand{\thelinecolor}{\colorlinecolor}}
\newcommand{\setbwlinecolor}[1]{\renewcommand{\bwlinecolor}{#1}\renewcommand{\thelinecolor}{\bwlinecolor}}

% this allows the above default to be overriden by using
% the \printincolor and \printinblackandwhite commands
% anywhere in the file. This allows you to switch back
% and forth between bw and color. (Who would want to?)
\newcommand{\colornamesuffix}{}

\newcommand{\printincolor}{\setboolean{in_color}{true}%
\renewcommand{\thelinecolor}{\colorlinecolor}
\renewcommand{\colornamesuffix}{}
}

\newcommand{\printinblackandwhite}{\setboolean{in_color}{false}%
\renewcommand{\thelinecolor}{\bwlinecolor}
\renewcommand{\colornamesuffix}{BW}
}

\newcommand{\myincludegraphics}[2][]{\includegraphics[#1]{#2\colornamesuffix}}
%\newcommand{\myincludegraphicsthree}[2][]{\includemedia[#1]{\includegraphics{#2}}{#2.prc}}
%\newcommand{\myincludegraphicsthree}[3]{{%
				%\ifthenelse{\boolean{in_threeD}}{% in 3D
				%\includemedia[#1]{\includegraphics{#3_3D}}{#3_3D.prc}}% now not in 3D
				%{\myincludegraphics[#2]{#3}}}}

\makeatletter
\newcommand{\myincludegraphicsthree}{\@ifstar \myincludegraphicsthreestarred \myincludegraphicsthreenostar}
\makeatother

\newcommand{\myincludegraphicsthreenostar}[3]{{%
				\ifthenelse{\boolean{in_threeD}}{% in 3D
				\includemedia[#1]{\includegraphics{#3_3D\colornamesuffix}}{#3_3D.prc}}% now not in 3D
				{\myincludegraphics[#2]{#3}}}}

\newcommand{\myincludegraphicsthreestarred}[3]{{%
				\ifthenelse{\boolean{in_threeD}}{% in 3D
				\includemedia[#1]{\includegraphics{#3\colornamesuffix}}{#3_3D.prc}}% now not in 3D
				{\myincludegraphics[#2]{#3}}}}


% the default is printing in color
\printincolor


%\newboolean{printlabelname}
%\setboolean{printlabelname}{true}
%\ifthenelse{\boolean{printlabelname}}{\usepackage[notref,notcite]{showkeys}}{}


%%%
%% Creates a lot of measurements - lengths - to use
%% later on. Explained when a value is set.
%%%


\newlength{\topmarginlength} 
\newlength{\bottommarginlength}
\newlength{\oddpagemarginlength}
\newlength{\evenpagemarginlength}
\newlength{\marginlinelength}


% measures how far from the text the example line is to be drawn
\setlength{\marginlinelength}{2pt}

% the height of the top margin
% used in calculating the lines for examples
\setlength{\topmarginlength}{-1in-\voffset}

% the length of the bottom margin (ish)
% actually starts at the top of the page, moves
% through the top margin length then the text height.
\setlength{\bottommarginlength}{-1in-\textheight-2\baselineskip-\voffset-\headheight-\headsep-\topmargin}

% the length of the left hand margin of an odd page
\setlength{\oddpagemarginlength}{1in+\hoffset+\oddsidemargin-2\marginlinelength}

% the length of the left hand margin of an even page
\setlength{\evenpagemarginlength}{1in+\hoffset+\evensidemargin-2\marginlinelength}


% creates a generic style for the lines. You can add lots
% of things here, all separated by commas.
\newcommand{\linestyle}{[thick, \thelinecolor]}

\newcommand{\setlinestyle}[1]{\renewcommand{\linestyle}{[#1, \thelinecolor]}}

% Do you want to draw the lines for examples? If so,
% use the first command. Otherwise, use the second. 
% The first is the default, but you can override it
% by using the second in your main file.
\newboolean{showexamplelines}
\newcommand{\drawexamplelines}{\setboolean{showexamplelines}{true}}
\newcommand{\nodrawexamplelines}{\setboolean{showexamplelines}{false}}

% by default the lines around the examples are drawn
\drawexamplelines


% This is more a debugging tool than a stylistic one.
% This draws a small circle in the margin at the the
% beginning of an example and another immediately follwing
% the end of the example, in the text. Sometimes it is useful
% to figure out why there seems to be a lot of space between
% the end of the example and the end of the drawn line.
% Too much space can occur, for instance, if the example ends with
% with a ``$$ maths $$'' type environment. You can correct for this
% with a \vskip -\baselineskip command.
\newboolean{showexamplemarks}
\newcommand{\drawexamplemarks}{\setboolean{showexamplemarks}{true}}
\newcommand{\nodrawexamplemarks}{\setboolean{showexamplemarks}{false}}
%\drawexamplemarks
\nodrawexamplemarks

\newboolean{exampleisintext}
\newcommand{\exampleinmargin}{\setboolean{exampleisintext}{false}}
\newcommand{\exampleintext}{\setboolean{exampleisintext}{true}}
\exampleintext

\newcounter{examplecounter}
\setcounter{examplecounter}{0}

% the example environment has a regular and starred version.
% the regular version takes 3 arguments: label, problem, solution.
% The starred version only has 2: label, problem/solution.
\makeatletter
\newcommand{\example}{\@ifstar \examplestarred \examplenostar}
\newcommand{\reverseexampledefault}{\renewcommand{\example}{\@ifstar \examplenostar \examplestarred}}
\newcommand{\restoreexampledefault}{\renewcommand{\example}{\@ifstar \examplestarred \examplenostar}}
\makeatother

%% This is the no-star (regular) version of
%% the example command.
\newcommand{\examplenostar}[4]{%
%\ifthenelse{\boolean{in_color}}{renewcommand{\thelinecolor}{\colorlinecolor}}{\renewcommand{\thelinecolor}{\bwlinecolor}}%
\noindent%
\ifthenelse{\boolean{exampleisintext}}
{% default: the Example word is in text
\hskip -2\marginlinelength%
\parbox{\marginlinelength}{%
\begin{tikzpicture}[remember picture,overlay]%
\ifthenelse{\boolean{showexamplelines}}{\ifthenelse{\boolean{showexamplemarks}}
{\draw (0,0) circle (1pt) node (#1) {};}%
{\draw (0,0) node (#1) {};}
}
{}% ends the ``Draw example lines and marks?'' booleans
\end{tikzpicture}%
}% ends parbox where line begins
\hskip \marginlinelength% puts us back in line
\parbox{80pt}{{\bf Example \refstepcounter{examplecounter}\theexamplecounter\label{#1}}}% ends parbox
%\ifthenelse{\boolean{printlabelname}}%
%{\hskip -35pt%
%\parbox{35pt}{\tiny\texttt{\detokenize{#1}}}%
%}%
%{}%
}% ends the if example in text; next do if not in text
{%
%\hskip -\marginlinelength%
\hskip -70pt%
\parbox{\marginlinelength}{%
\begin{tikzpicture}[remember picture,overlay]%
\ifthenelse{\boolean{showexamplelines}}{\ifthenelse{\boolean{showexamplemarks}}
{\draw (0,0) circle (1pt) node (#1) {};}%
{\draw (0,0) node (#1) {};}
}%
{}% ends the ``Draw example lines and marks?'' booleans
\end{tikzpicture}%
}%
\hskip -\marginlinelength
\parbox{70pt}{{\bf Example \refstepcounter{examplecounter}\theexamplecounter\label{#1}}}% ends parbox
}% ends if example in text
\ifthenelse{\pageref{#1}=\pageref{e#1}}% if the beginning and end are on the same page
{%
\textbf{#2}\\
#3 \vskip \baselineskip%
\ifthenelse{\boolean{exampleisintext}}
{%solution is in text
\parbox{65pt}{\textsc{\small\bfseries Solution}}% 
}% solution is in margin
{\hskip -80pt%
\parbox{65pt}{\textsc{\small\bfseries Solution}}% 
\hskip 15pt%
}% end solution in margin
#4\nopagebreak\label{e#1}% writes the full example then draws the lines
\ifthenelse{\boolean{showexamplelines}}{%
\begin{tikzpicture}[remember picture,overlay]%
\ifthenelse{\boolean{showexamplemarks}}
{\draw (0,0) circle (1pt) node (e#1) {};}%
{\draw (0,0) node (e#1) {};}%
\ifthenelse{\boolean{exampleisintext}}
{\draw \linestyle (#1) -- (#1.south |- e#1.south) -- ++(10pt,0);}
{\draw \linestyle ([yshift=-3pt]#1.south) -- ++(70pt-2\marginlinelength,0) node (f#1) {} -- (f#1 |- e#1.south) -- ++(10pt,0);} 
\end{tikzpicture}
}{}% ends if/then/else show lines
}% ends if beginning and end are on same page.
% next is if they are on different pages
{% first draw line from start to bottom of page
\ifthenelse{\boolean{showexamplelines}}{%
\begin{tikzpicture}[remember picture,overlay]% 
\ifthenelse{\isodd{\pageref{#1}}}% draws lines based on whether on an even or odd page %
{\node [xshift=\oddpagemarginlength,yshift=\bottommarginlength](bottomleft) at (current page.north west)  {};}%
{\node [xshift=\evenpagemarginlength,yshift=\bottommarginlength](bottomleft) at (current page.north west)  {};}%
\ifthenelse{\boolean{exampleisintext}}% is example in text?
{\draw \linestyle (#1) -- (bottomleft);}%
{\draw \linestyle ([yshift=-3pt]#1.south) -- ++(70pt-2\marginlinelength,0) --(bottomleft);}% 
\end{tikzpicture}%
}{}% ends if/then/else show lines
% end drawing of line
\textbf{#2}\\
#3 \vskip \baselineskip%
\ifthenelse{\boolean{exampleisintext}}%
{%solution is in text
\parbox{65pt}{\textsc{\small\bfseries Solution}}% 
}% solution is in margin
{\hskip -80pt%
\parbox{65pt}{\textsc{\small\bfseries Solution}}% 
\hskip 15pt%
}% end solution in margin
#4\label{e#1}% now write out full example
% now draw line from end to top of page
\ifthenelse{\boolean{showexamplelines}}{%
\begin{tikzpicture}[remember picture,overlay] 
\ifthenelse{\boolean{showexamplemarks}}
{\draw (0,0) circle (1pt) node (e#1) {};}%
{\draw (0,0) node (e#1) {};}%
\ifthenelse{\isodd{\pageref{e#1}}}% draws lines based on whether on an even or odd page %
{\node [xshift=\oddpagemarginlength,yshift=\topmarginlength](topleft) at (current page.north west)  {};}
{\node [xshift=\evenpagemarginlength,yshift=\topmarginlength](topleft) at (current page.north west)  {};}
\draw \linestyle (topleft)--(e#1.south -| topleft) -- ++(10pt,0);
\end{tikzpicture}%
}{}% ends if/then/else show lines
}% ends the check for same page or not
%
}%ends the definition of example


\newcommand{\examplestarred}[3]{%
%\ifthenelse{\boolean{in_color}}{renewcommand{\thelinecolor}{\colorlinecolor}}{\renewcommand{\thelinecolor}{\bwlinecolor}}%
\noindent%
\ifthenelse{\boolean{exampleisintext}}
{% default: the Example word is in text
\hskip -2\marginlinelength%
\parbox{\marginlinelength}{%
\begin{tikzpicture}[remember picture,overlay]%
\ifthenelse{\boolean{showexamplelines}}{\ifthenelse{\boolean{showexamplemarks}}
{\draw (0,0) circle (1pt) node (#1) {};}%
{\draw (0,0) node (#1) {};}
}
{}% ends the ``Draw example lines and marks?'' booleans
\end{tikzpicture}%
}% ends parbox where line begins
\hskip \marginlinelength% puts us back in line
\parbox{80pt}{{\bf Example \refstepcounter{examplecounter}\theexamplecounter\label{#1}}}% ends parbox
}% ends the if example in text; next do if not in text
{%
%\hskip -\marginlinelength%
\hskip -70pt%
\parbox{\marginlinelength}{%
\begin{tikzpicture}[remember picture,overlay]%
\ifthenelse{\boolean{showexamplelines}}{\ifthenelse{\boolean{showexamplemarks}}
{\draw (0,0) circle (1pt) node (#1) {};}%
{\draw (0,0) node (#1) {};}
}%
{}% ends the ``Draw example lines and marks?'' booleans
\end{tikzpicture}%
}%
\hskip -\marginlinelength
\parbox{70pt}{{\bf Example \refstepcounter{examplecounter}\theexamplecounter\label{#1}}}% ends parbox
}% ends if example in text
\ifthenelse{\pageref{#1}=\pageref{e#1}}% if the beginning and end are on the same page
{%
\textbf{#2}\\
#3 \label{e#1}% writes the full example then draws the lines
\ifthenelse{\boolean{showexamplelines}}{%
\begin{tikzpicture}[remember picture,overlay]%
\ifthenelse{\boolean{showexamplemarks}}
{\draw (0,0) circle (1pt) node (e#1) {};}%
{\draw (0,0) node (e#1) {};}%
\ifthenelse{\boolean{exampleisintext}}
{\draw \linestyle (#1) -- (#1.south |- e#1.south) -- ++(10pt,0);}
{\draw \linestyle ([yshift=-3pt]#1.south) -- ++(70pt-2\marginlinelength,0) node (f#1) {} -- (f#1 |- e#1.south) -- ++(10pt,0);}%
\end{tikzpicture}%
}{}% ends if/then/else show lines
}% ends if beginning and end are on same page.
% next is if they are on different pages
{% first draw line from start to bottom of page
\ifthenelse{\boolean{showexamplelines}}{%
\begin{tikzpicture}[remember picture,overlay]% 
\ifthenelse{\isodd{\pageref{#1}}}% draws lines based on whether on an even or odd page %
{\node [xshift=\oddpagemarginlength,yshift=\bottommarginlength](bottomleft) at (current page.north west)  {};}%
{\node [xshift=\evenpagemarginlength,yshift=\bottommarginlength](bottomleft) at (current page.north west)  {};}%
\ifthenelse{\boolean{exampleisintext}}% is example in text?
{\draw \linestyle (#1) -- (bottomleft);}%
{\draw \linestyle ([yshift=-3pt]#1.south) -- ++(70pt-2\marginlinelength,0) --(bottomleft);}%
\end{tikzpicture}%
}{}% ends if/then/else show lines
% end drawing of line
\textbf{#2}\\
#3 \label{e#1}% now write out full example
% now draw line from end to top of page
\ifthenelse{\boolean{showexamplelines}}{%
\begin{tikzpicture}[remember picture,overlay] 
\ifthenelse{\boolean{showexamplemarks}}
{\draw (0,0) circle (1pt) node (e#1) {};}%
{\draw (0,0) node (e#1) {};}%
\ifthenelse{\isodd{\pageref{e#1}}}% draws lines based on whether on an even or odd page %
{\node [xshift=\oddpagemarginlength,yshift=\topmarginlength](topleft) at (current page.north west)  {};}
{\node [xshift=\evenpagemarginlength,yshift=\topmarginlength](topleft) at (current page.north west)  {};}
\draw \linestyle (topleft)--(e#1.south -| topleft) -- ++(10pt,0);
\end{tikzpicture}%
}{}% ends if/then/else show lines
}% ends the check for same page or not
%
}%ends the definition of examplestarred

% Draws a line on a page that doesn't contain either
% the beginning or end of an example.
% Takes no arguments; figures out if you 
% are on an even or odd numbered page for
% correct margin calculation
\newcommand{\drawexampleline}{%
\begin{tikzpicture}[remember picture,overlay]
				\ifthenelse{\isodd{\thepage}}{%
				\node [xshift=\oddpagemarginlength,yshift=\topmarginlength](tleft) at (current page.north west)  {};}
				{\node [xshift=\evenpagemarginlength,yshift=\topmarginlength](tleft) at (current page.north west)  {};}
        \draw \linestyle (tleft) -- ++(0,\bottommarginlength+1in);
        \end{tikzpicture}%
}

%
%Define style for Definitions, Theorems and Key Ideas  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%


\newlength{\specialboxlength}
\newlength{\specialboxtitlelength}
\newlength{\specialboxinnerseplength}
\newlength{\specialboxinnerseplengthx}
\newlength{\specialboxinnerseplengthy}

\setlength{\specialboxtitlelength}{75pt}
\setlength{\specialboxinnerseplength}{15pt}
\setlength{\specialboxinnerseplengthx}{15pt}
\setlength{\specialboxinnerseplengthy}{10pt}
%\setlength{\specialboxlength}{\textwidth-\specialboxtitlelength-2\specialboxinnerseplength}
\setlength{\specialboxlength}{\textwidth-2\specialboxinnerseplength}

\newcommand{\setboxwidth}[1]{\setlength{\specialboxlength}{\textwidth+#1-2\specialboxinnerseplength}}
\newcommand{\restoreboxwidth}{\setlength{\specialboxlength}{\textwidth-2\specialboxinnerseplength}}

%\long\def\newspecialbox#1#2#3#4{%
%\newcounter{#1counter}
%\expandafter\long\expandafter\def\csname #1\endcsname ##1##2{%
%\vskip\baselineskip
%\noindent\refstepcounter{#1counter}\label{##1}%
%\begin{tikzpicture}
%\draw (0,0) node[anchor=north west,text width=\specialboxtitlelength,inner sep=0pt]{\bf #2 \the\value{#1counter}};
%\ifthenelse{\boolean{in_color}} %first, in color
%{\draw (\specialboxtitlelength,0) node[rectangle,text width = \specialboxlength, inner sep=\specialboxinnerseplength, anchor=north west,yshift=\specialboxinnerseplength] [#3] {##2};}%if not in color
%{\draw (\specialboxtitlelength,0) node[rectangle,text width = \specialboxlength, inner sep=\specialboxinnerseplength, anchor=north west,yshift=\specialboxinnerseplength]
% [#4] {##2};}
%\end{tikzpicture}
%}
%}

\long\def\newspecialbox#1#2#3#4{%
\newcounter{#1counter}
\expandafter\long\expandafter\def\csname #1\endcsname ##1##2##3{%
\vskip\baselineskip
\noindent\refstepcounter{#1counter}\label{##1}%
\begin{tikzpicture}
%\draw (0,0) node[anchor=north west,text width=\specialboxtitlelength,inner sep=0pt]{\bf #2 \the\value{#1counter}};
\ifthenelse{\boolean{in_color}} %first, in color
{\draw (\specialboxtitlelength,0) node[rectangle,text width = \specialboxlength, inner xsep=\specialboxinnerseplengthx, inner ysep=\specialboxinnerseplengthy, anchor=north west,yshift=\specialboxinnerseplengthy] [#3] {\textbf{#2 \the\value{#1counter}\hskip 20pt ##2%
}\vskip.5\baselineskip%\\

##3};}%if not in color
{\draw (\specialboxtitlelength,0) node[draw=black,thick,rectangle,text width = \specialboxlength, inner xsep=\specialboxinnerseplengthx, inner ysep=\specialboxinnerseplengthy, anchor=north west,yshift=\specialboxinnerseplengthy] [#4]  {\textbf{#2 \the\value{#1counter}\hskip 20pt ##2%
}\vskip.5\baselineskip%\\

##3};}
\end{tikzpicture}
}
}


\newspecialbox{definition}{Definition}{draw = yellow!95!black!60,top color = white!95!yellow, bottom color = yellow!90!black!30, text justified, very thick}{draw, text justified, very thick}

\newspecialbox{theorem}{Theorem}{draw = green!30!black!50,top color = white!95!green, bottom color = green!60!black!20, text justified, very thick}{draw, text justified, very thick}

\newspecialbox{keyidea}{Key Idea}{draw = red!30!black!50,top color = white!95!red, bottom color = red!60!black!20, text justified, very thick}{draw, text justified, very thick}


%%%%
%% Begins the exercise section, containing all commands
%% related to creating problem sections.
%%%%

\newcommand{\exc}{\addtocounter{excounter}{2}\arabic{excounter}}

\newif\ifmore

\newif\ifexsetmore

% this counter gives an effective, albeit not elegant
% way of using the same command to both print questions
% or the answers, depending on what section you are in.
% showexercises = 1: print questions
% showexercises = 2: print odd answers only
% showexercises = 3: print all answers 
% 
% The subsequent lines sets the value 


\setlength{\columnsep}{20pt}

\newcommand{\printconcepts}{\noindent\textit{\Large Terms and Concepts}\vskip \baselineskip}
\newcommand{\printproblems}{\vskip \baselineskip\noindent\textit{\Large Problems}\vskip \baselineskip}
\newcommand{\printreview}{\vskip \baselineskip\noindent\textit{\Large Review}\vskip \baselineskip}

\newcommand{\inanswersection}{%
	\renewcommand{\printconcepts}{}%
	\renewcommand{\printproblems}{}%
	\renewcommand{\printreview}{}%
}%

\newcount\showexercises
\newboolean{printquestions}
\newboolean{printoddanswersonly}

\setboolean{printoddanswersonly}{true}
\newcommand{\printallanswers}{\setboolean{printoddanswersonly}{false}}


\newcount\numberofexercises

\newcounter{numofexer}
\newcounter{negnumofexer}

% used for debugging; not really used anymore
\newcounter{debug}
\setcounter{debug}{0}

\newcounter{exercisecounter}
\newcounter{IMTcount}
\newcounter{IMTcount_temp}

% the exercise names can be printed next to the problem
% using these commands. The default is to not print them.
\newboolean{showexercisenames}
\newcommand{\printexercisenames}{\setboolean{showexercisenames}{true}}
\newcommand{\noprintexercisenames}{\setboolean{showexercisenames}{false}}
\noprintexercisenames


% TeX uses a certain system to name input files that it reads from.
% To prevent conflicts, we use the newread command.
\newread\exread %read an example
\newread\exsetread %read an example set
\newread\exansread %read the answer
\newread\printansread% read in the answers file

\newwrite\answrite %write the answers file
% give the answers file the name ``jobname.answers''
\openout\answrite=\jobname.answers

\def\exinput #1 {\ifthenelse{\boolean{printquestions}}{% 
												\openin\exread=#1 
												\read\exread to \tempp%
%												\begin{adjustwidth*}{}{-100pt}% 
												\begin{enumerate}[leftmargin=*,topsep=10pt]% 
													\addtocounter{enumi}{\theexercisecounter}%
													\item% 
													\ifthenelse{\boolean{showexercisenames}}%
													{\tiny{\hskip -60pt}% This line too
												  \makebox[60pt][l]{\printexercisename #1 }%  
												  \small%
												  }{}%
													\tempp 
													\addtocounter{exercisecounter}{1}
												\end{enumerate}
%												\end{adjustwidth*}%
												\closein\exread}% end print questions 
									{% else: print answers
									\ifthenelse{\boolean{printoddanswersonly}}{%i.e, we are printing odd answers, not questions 
												\openin\exread=#1 
												\read\exread to \tempp % read in the question - we ignore it.
												\addtocounter{exercisecounter}{1}
												\read\exread to \tempp % reads in the answer
												\ifodd \theexercisecounter
												%\else
													\begin{enumerate}[leftmargin=*] 
													\addtocounter{enumi}{\theexercisecounter}
													\addtocounter{enumi}{-1}
													\item 
													\ifthenelse{\boolean{showexercisenames}}
													{\tiny{\hskip -60pt}% This line too
												  \makebox[60pt][l]{\printexercisename #1 }%
												  \small%
												  }{}
													\tempp 
													%\addtocounter{exercisecounter}{1}
													\end{enumerate} 
												\fi
												\closein\exread 
												}  %ends the \ifnum \showexercises = 2 if statement
												{% print all answers
												\openin\exread=#1 
												\read\exread to \tempp %reads in the question, which is ignored 
												\read\exread to \tempp %reads in the answer
												\begin{enumerate}[leftmargin=*] 
													\addtocounter{enumi}{\theexercisecounter}
													\item% 
													\ifthenelse{\boolean{showexercisenames}}
													{\tiny{\hskip -60pt}% This line too
												  \makebox[60pt][l]{\printexercisename #1 }%
												  \small%
												  }{}
													\tempp 
													\addtocounter{exercisecounter}{1}
												\end{enumerate}
												\closein\exread
												} % ends the \ifnum \showexercises=3 if statement
									}
								}

\def\exsetinput #1 {\openin\exsetread=#1%
										\setcounter{numofexer}{0}%
										\setcounter{negnumofexer}{0}% 
										\read\exsetread to \exsettemp%
										\read\exsetread to \exsettemp%
										{\loop%
												\read\exsetread to \exsettemp%
												\ifeof \exsetread \exsetmorefalse \else \exsetmoretrue \fi%
												\ifexsetmore%
														\addtocounter{numofexer}{1}%
														\addtocounter{negnumofexer}{-1}%
											\repeat}%							
										\closein\exsetread%
										\openin\exsetread=#1%
										\ifthenelse{\boolean{printquestions}}{% 
											\read\exsetread to \exsettemp%
											\setcounter{enumi}{\theexercisecounter} %
											\addtocounter{enumi}{1}%
											\ifthenelse{\boolean{showexercisenames}}%
													{\tiny{\hskip -60pt}% This line too
												  \makebox[60pt][l]{\printexercisename #1 }%
												  \small%
												  }{}% end show exercise names
%											\begin{adjustwidth*}{}{-100pt}%
											\noindent\textbf{\exsettemp\theenumi\addtocounter{enumi}{-1}%
											\addtocounter{enumi}{\thenumofexer}{ -- }\theenumi%
											\addtocounter{enumi}{\thenegnumofexer}%
											\read\exsetread to \exsettemp \exsettemp}%
%											\end{adjustwidth*}%
											
											{\loop%
													\read\exsetread to \exsettemp%
													\ifeof \exsetread \exsetmorefalse \else \exsetmoretrue \fi%
													\ifexsetmore%
															\exsettemp%
											\repeat}%
										}% ends print exercises; on to print answers
										{	\read\exsetread to \exsettemp%
											\read\exsetread to \exsettemp%
											{\loop%
													\read\exsetread to \exsettemp%
													\ifeof \exsetread \exsetmorefalse \else \exsetmoretrue \fi%
													\ifexsetmore%
															\exsettemp%
											\repeat}%
										}%ends else printing asnwers
										\closein\exsetread%
								}%

\def\printexercises #1 {%
\ifthenelse{\equal{\expandafter\readsection\thesection}{1}}{\immediate\write\answrite{\noexpand \noindent {\noexpand\Large\noexpand\bf Chapter \thechapter} \noexpand \vskip \noexpand\baselineskip } \write\answrite{}}{}%
\immediate\write\answrite{\noexpand\noindent {\noexpand\bf Section \thesection} \noexpand \vskip \baselineskip}%
\write\answrite{\noexpand\printanswers{#1}}%
%\strictpagecheck%
\setcounter{exercisecounter}{0}\setboolean{printquestions}{true}%
%\thispagestyle{empty}%
%\begin{adjustwidth*}{}{-100pt}%
\exercisegeometry%
\exerciseheader%
\small%
\noindent\underline{\parbox{\textwidth}{\huge\textbf{Exercises \thesection} }}% 
\sffamily%
\vskip\baselineskip%
\begin{multicols}{2}%
				\openin\exansread=#1 
				\ifeof \exansread 
					{No problems written.} 
				\else 
					\loop \read\exansread to \extemp  
							\ifeof \exansread \morefalse \else \moretrue \fi 
							\ifmore 
									\extemp
							\repeat 
				\fi 
				\closein\exansread 
				\end{multicols}
%				\end{adjustwidth*}%
				\restoregeometry
				\regularheader
%				\easypagecheck
				\setlength{\hoffset}{0pt} \rmfamily\normalsize \vskip \baselineskip%
				}
				


% The following prints the answers. To print all answers, use command \printallanswers.
% 
\def\printanswers #1 {\setcounter{exercisecounter}{0} \footnotesize \setboolean{printquestions}{false} \openin\printansread=#1 
				\ifeof \printansread 
					{No problems written.} 
				\else 
					\loop \read\printansread to \extemp  
							\ifeof \printansread \morefalse \else \moretrue \fi 
							\ifmore 
									\extemp
							\fi 
							\ifeof \printansread \morefalse \else \moretrue \fi 
							\ifmore 
					\repeat 
				\fi 
				\closein\printansread
				\small}

								
\def \printexercisename exercises/#1_#2_#3_#4 {#1 #2 #3 #4}

%%%%%%%%%%%%% Used to automate the answer production at
%%%%%%%%%%%%% end the text.

\ifthenelse{\boolean{longpage}}%
{% if longpage, readsection does nothing, really
\def\readsection #1{#1}%
}%
{% not longpage: usual readsection
\def \readsection #1.#2{#2}
}%

\def \writeexercisestofile #1{%
\write\answrite{\noexpand\printanswers{exercises/0\thechapter_0\expandafter\readsection #1_exercises.tex} \noexpand \vskip \baselineskip } \write\answrite{} }

\def \makeexercisesection #1{\immediate\write\answrite{\noexpand\end{multicols}%
\noexpand\normalsize}%
\immediate\closeout\answrite\inanswersection\exercisegeometry\exerciseheader\chapter{#1}%
\input{\jobname.answers}\restoregeometry\regularheader%
\setlength{\hoffset}{0pt}\rmfamily\normalsize}%

%\def \makeexercisesection{\immediate\write\answrite{\noexpand\end{multicols}%
%\noexpand\normalsize}%
%\immediate\closeout\answrite}
%
%\def \printexercisesection #1{%
%\inanswersection\exercisegeometry\exerciseheader\chapter{#1}\input{\jobname.answers}\input{tobedone}\input{\jobname.answers}\section{\jobname}\restoregeometry\regularheader%
%\setlength{\hoffset}{0pt}\rmfamily\normalsize}

%
% The following is a line of code, not a definition. 
% It writes the first line of the ``.answers'' file
% to set up the proper formatting of that file.
%
\write\answrite{\noexpand\small\noexpand\raggedright\noexpand\begin{multicols}{2}}
\write\answrite{\noexpand\thispagestyle{empty}}