diffyqssetup.sty

%FIXME: for PRINT run for lulu or kdp, search for %PRINT  (also
%search diffyqs.tex)

\usepackage{ifpdf}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage{graphicx}
\usepackage{color}

% Times
%\usepackage{txfonts}
% NewTX fonts are nicer, though slightly looser.  Using these we
% can get rid of the extra spaces e.g. {\vec{x}\,}', if going back
% to txfonts, these would need to be stuck back in.  One disadvantage
% is that newtx fonts seem to be changing from time to time leading
% to possible changes in pagination ...
%\usepackage[tighter,defaultsups]{newtxtext}
%\usepackage[vvarbb]{newtxmath}
%STIX
%\usepackage{stix}
%\usepackage{stix2}
%KP
%\usepackage{kpfonts}

%Palatino
%\usepackage{mathpazo}
%\usepackage[scaled]{helvet}
\usepackage{newpxtext}
\usepackage[vvarbb]{newpxmath}
\linespread{1.05}

% Utopia
%\usepackage{fourier}
%\usepackage[scaled]{helvet}

%\usepackage{fouriernc}


% San Serif fonts
%\renewcommand{\familydefault}{\sfdefault}


\usepackage[T1]{fontenc}

\usepackage{tasks}
\usepackage{footnote}
\makesavenoteenv{tasks}

\usepackage[shortlabels]{enumitem}

%\usepackage{graphics}
\usepackage{tcolorbox}

\tcbuselibrary{theorems}

% Remove page numbers on chapter opens
\usepackage{titlesec}
\assignpagestyle{\chapter}{empty}

\usepackage[headings]{fullpage}

% smaller margins top/bottom margins
\addtolength{\textheight}{0.8in}
\addtolength{\topmargin}{-0.3in}

%PRINT
%First offset even/odd pages a bit
% not for the coil bound version, we want large margins there
%\addtolength{\oddsidemargin}{0.2in}
%\addtolength{\evensidemargin}{-0.2in}

%PRINT
%Now cut page size a bit.  I'll run it through ghostcript anyway
%to convert to the right size, but this is good for crown quatro
%conversion, don't use for the full letter size (coil) versions
%\addtolength{\paperwidth}{-0.3in}
%\addtolength{\paperheight}{-1in}
%\addtolength{\topmargin}{-0.5in}
%\addtolength{\oddsidemargin}{-0.15in}
%\addtolength{\evensidemargin}{-0.15in}

\usepackage{url}
\usepackage{varioref}
\usepackage{makeidx}
\usepackage{hyperref} % do NOT set [ocgcolorlinks] here!

%If you have an older tex installation you might need
%to comment out the next line:
%PRINT (COMMENT OUT FOR PRINT)
\usepackage[ocgcolorlinks]{ocgx2} %run without for lulu/kdp

\usepackage{hypcap}
\usepackage[font={small,it}]{caption}
\usepackage{tikz-cd}
\usepackage{units}
\usepackage{booktabs}
\usepackage{microtype}
\usepackage{cancel}
% This is my modified wrapfig that doesn't use intextsep
\usepackage{mywrapfig}
\usepackage{import}

% Footnotes should use symbols, not numbers.  Numbered footnotes are
% evil, (footmisc no longer conflicts with hyperref)
\usepackage[perpage,symbol*]{footmisc}

% discourage pagebreak at end of display, put before \end{equation}
\newcommand{\avoidbreak}{\postdisplaypenalty=100}

\definecolor{mypersianblue}{rgb}{0.11, 0.22, 0.73}

\hypersetup{
    pdfborderstyle={/S/U/W 0.5},
    %PRINT do this (and comment out the above):
    %pdfborder={0 0 0},
    citecolor=mypersianblue,
    filecolor=mypersianblue,
    linkcolor=mypersianblue,
    urlcolor=mypersianblue,
    pdftitle={Notes on Diffy Qs: Differential Equations for Engineers},
    pdfsubject={Differential Equations},
    pdfkeywords={differential equations, ODE, PDE, Fourier series, Laplace
transform},
    pdfauthor={Jiri Lebl}
}

% Set up our index
\makeindex

% Very simple indexing
\newcommand{\myindex}[1]{#1\index{#1}}

% Quotes
\newcommand{\myquote}[1]{``#1''}

% define this to be empty to kill notes
\newcommand{\sectionnotes}[1]{\noindent \emph{Note: #1} \medskip \par}

% Define this to be empty to not skip page before the sections to
% save some paper
\newcommand{\sectionnewpage}{\clearpage}
%\newcommand{\sectionnewpage}{}

% This is used throughout for less obtrusive references to EP.
% Make it blank to remove unnecessary references to EP.
\newcommand{\EPref}[1]{#1}
%\newcommand{\EPref}[1]{}

%references to BD
\newcommand{\BDref}[1]{#1}
%\newcommand{\BDref}[1]{}

% Don't include subsections
\setcounter{tocdepth}{1}

\theoremstyle{plain}
\newtheorem{theorem}{Theorem}[section]

\newtheoremstyle{exercise}% name
  {}% Space above
  {}% Space below
  {\itshape}% Body font
  {}% Indent amount 1
  {\bfseries \itshape}% Theorem head font
  {:}% Punctuation after theorem head
  {.5em}% Space after theorem head 2
  {}% Theorem head spec (can be left empty, meaning "normal")


\theoremstyle{exercise}
\newtheorem{exercise}{Exercise}[section]

% Answers
\newbox\answerscollect

\newcommand{\theanswer}{\textbf{\theexercise:}}

\def\exsol#1{\setbox\answerscollect=\vbox{\unvbox\answerscollect\medskip\par\noindent\theanswer\quad #1\par}}
\def\printanswers{
 \cleardoublepage  
 \phantomsection
 \chapter*{Solutions to Selected Exercises}
 \markboth{SOLUTIONS TO SELECTED EXERCISES}{SOLUTIONS TO SELECTED EXERCISES}
 \addfakecontentsline{Solutions to Selected Exercises}
 \unvbox\answerscollect\setbox\answerscollect=\vbox{}
}

%\newtheoremstyle{example}% name
%  {}% Space above
%  {}% Space below
%  {}% Body font
%  {}% Indent amount 1
%  {\bfseries}% Theorem head font
%  {:}% Punctuation after theorem head
%  {.5em}% Space after theorem head 2
%  {}% Theorem head spec (can be left empty, meaning "normal")
%
%\theoremstyle{example}
%\newtheorem{example}{Example}[section]
%\newtheorem{remark}{Remark}[section]
%

%%
%% Hand made example and remark so that it works with floating figure
%%
\newcounter{example}[section]
\renewcommand{\theexample}{\thesection.\arabic{example}}
\def\exampleclaim{\par\addvspace{\medskipamount}\noindent\refstepcounter{example}\hbox{\bf
Example
\thesection.\arabic{example}:}\hspace{0.5em}\ignorespaces}
\def\exampleclaimname#1{\par\addvspace{\medskipamount}\noindent\refstepcounter{example}\hbox{\bf
Example
\thesection.\arabic{example} {\rm (#1)}:}\hspace{0.5em}\ignorespaces}
\def\endexampleclaim{
\par\addvspace{\medskipamount}}
\newenvironment{example}[1][]{\ifx\namearg#1\namearg\exampleclaim\else\exampleclaimname{#1}\fi}{\endexampleclaim}

\newcounter{remark}[section]
\renewcommand{\theremark}{\thesection.\arabic{remark}}
\def\remarkclaim{\par\addvspace{\medskipamount}\noindent\refstepcounter{remark}\hbox{\bf
Remark
\thesection.\arabic{remark}:}\hspace{0.5em}\ignorespaces}
\def\remarkclaimname#1{\par\addvspace{\medskipamount}\noindent\refstepcounter{remark}\hbox{\bf
Remark
\thesection.\arabic{remark} {\rm (#1)}:}\hspace{0.5em}\ignorespaces}
\def\endremarkclaim{
\par\addvspace{\medskipamount}}
\newenvironment{remark}[1][]{\ifx\namearg#1\namearg\remarkclaim\else\remarkclaimname{#1}\fi}{\endremarkclaim}


% referencing
\makeatletter
    \DeclareRobustCommand{\myvref}[2]{%
      \leavevmode%
      \begingroup
        \let\T@pageref\@pagerefstar
        \hyperref[{#2}]{%
	  #1~\ref*{#2}%
        }%
        \vpageref[\unskip]{#2}%
      \endgroup
    }%

    \DeclareRobustCommand{\myref}[2]{%
      \leavevmode%
      \begingroup
        \let\T@pageref\@pagerefstar
        \hyperref[{#2}]{%
	  #1~\ref*{#2}%
        }%
      \endgroup
    }%
\makeatother

\newcommand{\figurevref}[1]{\myvref{Figure}{#1}}
\newcommand{\figureref}[1]{\myref{Figure}{#1}}
\newcommand{\tablevref}[1]{\myvref{Table}{#1}}
\newcommand{\tableref}[1]{\myref{Table}{#1}}
\newcommand{\chapterref}[1]{\myref{chapter}{#1}}
\newcommand{\Chapterref}[1]{\myref{Chapter}{#1}}
\newcommand{\appendixref}[1]{\myref{appendix}{#1}}
\newcommand{\Appendixref}[1]{\myref{Appendix}{#1}}
\newcommand{\sectionref}[1]{\myref{\S}{#1}}
\newcommand{\subsectionref}[1]{\myref{subsection}{#1}}
\newcommand{\subsectionvref}[1]{\myvref{subsection}{#1}}
\newcommand{\exercisevref}[1]{\myvref{Exercise}{#1}}
\newcommand{\exerciseref}[1]{\myref{Exercise}{#1}}
\newcommand{\examplevref}[1]{\myvref{Example}{#1}}
\newcommand{\exampleref}[1]{\myref{Example}{#1}}
\newcommand{\thmvref}[1]{\myvref{Theorem}{#1}}
\newcommand{\thmref}[1]{\myref{Theorem}{#1}}
\newcommand{\remarkref}[1]{\myref{Remark}{#1}}



% Here we input .pdf_t files
\newcommand{\inputpdft}[1]{\subimport*{figures/}{#1.pdf_t}}

%Fake contents lines
\newcommand{\addfakecontentsline}[1]{\addcontentsline{toc}{chapter}{#1}}

%Extra space in table of contents to make things fit
\newcommand{\addextraspacetotoc}{\addtocontents{toc}{\protect\enlargethispage{\baselineskip}}}

% graphics include
\newcommand{\diffyincludegraphics}[3]{\includegraphics[#1]{figures/#3}}

% only for pdf output
\newcommand{\diffypdfversion}[1]{#1}

% this draws a frame (implemented not as an environment as that for some
% reason does not play well with wrapfigure
\newcommand{\mybeginframe}{%
\begin{tcolorbox}[colback=white,colframe=lightgray,left=5pt,right=5pt]%
}
\newcommand{\myendframe}{%
\end{tcolorbox}%
}

\newcommand{\mybxbg}[1]{\tcboxmath[colback=white,colframe=black,boxrule=0.5pt,top=1.5pt,bottom=1.5pt]{#1}}
\newcommand{\mybxsm}[1]{\tcboxmath[colback=white,colframe=black,boxrule=0.5pt,left=0pt,right=0pt,top=0pt,bottom=0pt]{#1}}

% floaty inset figures

% this one should have a caption, first argument is the size
\newenvironment{mywrapfig}[2][]{
 \wrapfigure[#1]{r}{#2}
 \mybeginframe
 \centering
}{%
 \myendframe
 \endwrapfigure
}

% this one has no caption, first argument is size,
% the second argument is a larger size used for HTML (ignored by latex)
\newenvironment{mywrapfigsimp}[3][]{%
 \wrapfigure[#1]{r}{#2}%
 \centering%
}{%
 \endwrapfigure%
}

% this is just my figure style
\newenvironment{myfig}{%
\begin{figure}[h!t]
\mybeginframe%
\centering%
}{%
\myendframe
\end{figure}%
}

% Note that floating (inset) figures work badly in theorem like environments
% as those are implemented as lists.  That's why example and remark are
% reimplemented instead of using amsthm

% Do vbox.  It really forces things to be on the same page but it's
% really a last ditch thing as it will also add some extra spacing, it
% should definitely not be applied if not needed.
\newenvironment{mysamepage}{\vbox\bgroup}{\egroup}

%Do the Index
\newcommand{\diffyindex}{
 \cleardoublepage  
 \phantomsection
 \addfakecontentsline{\indexname}
 \printindex
}

%Do the TOC
\newcommand{\diffytableofcontents}{
\microtypesetup{protrusion=false}
\tableofcontents
\microtypesetup{protrusion=true}
}

% A title page
\newcommand{\makediffytitlepage}{
 \ifpdf
   \pdfbookmark{Title Page}{title}
 \fi
 \newlength{\centeroffset}
 \setlength{\centeroffset}{-0.5\oddsidemargin}
 \addtolength{\centeroffset}{0.5\evensidemargin}
 %\addtolength{\textwidth}{-\centeroffset}
 \thispagestyle{empty}
 \vspace*{\stretch{1}}
 \noindent\hspace*{\centeroffset}\makebox[0pt][l]{\begin{minipage}{\textwidth}
 \flushright
 {\Huge\bfseries \sffamily Notes on Diffy Qs }
 \noindent\rule[-1ex]{\textwidth}{5pt}\\[2.5ex]
 \hfill\emph{\Large \sffamily Differential Equations for Engineers}
 \end{minipage}}
 
 \vspace{\stretch{1}}
 \noindent\hspace*{\centeroffset}\makebox[0pt][l]{\begin{minipage}{\textwidth}
 \flushright
 {\bfseries 
 by Ji{\v r}\'i Lebl\\[3ex]} 
 \today
 \\
 (version \theversion)
 \end{minipage}}
 
 %\addtolength{\textwidth}{\centeroffset}
 \vspace{\stretch{2}}
}