main.tex

\documentclass[11pt, letterpaper, titlepage]{report}
\usepackage[utf8]{inputenc}
\usepackage{geometry}
\usepackage{color,graphicx,overpic,wrapfig} 
\usepackage{fancyhdr} % header/footer stuff
\usepackage{amssymb} % math symbols
\usepackage{mathtools} % more math stuff
\usepackage{siunitx} % for SI units, ex. $3.5 ~ \si{kg.s^{-2}}$
\usepackage{hyperref} % for hyperlinks
\usepackage{subfiles}

% Page geometry
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% Indentation/space between paragraphs
\setlength{\headheight}{12pt}
\renewcommand{\baselinestretch}{1.5} 
\setlength{\parskip}{0.3cm}
\setlength{\parindent}{0.6cm}

% Title page
\title{\textbf{\Huge{ \begin{center}
Physics 230 Notes\\ % Document name
\end{center} }}}
\author{ Lora Ma and Benjamin Kong\\}

% Header/Footer
\pagestyle{fancy}
\rhead{\thepage}
\lhead{Header}
\rfoot{}

% Hyperlink colors
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    colorlinks=true,
    linkcolor=blue,
    filecolor=blue,      
    urlcolor=blue,
}

	% Format for creating new command: \newcommand{name}[num][default]{definition} 
\DeclareMathOperator{\di}{d\!} % derivative operator symbol, ex. $\int f(x) \di x$
\newcommand{\Eval}[3]{\left.#1\right\rvert_{#2}^{#3}} % evaluation bar (ex. evaluating integral or $\Eval{F(x)}{0}{2}$)
\newcommand{\barrows}{\textcolor{magenta}{\Longrightarrow}\quad} % long arrow (start of line)
\newcommand{\barrow}{\quad\textcolor{magenta}{\Longrightarrow}\quad} %long arrow 
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\newcommand{\limi}[1][n]{ \lim_{{#1}\to\infty} } % limit as n goes to infinity
\newcommand{\ddx}[1][x]{ \dfrac{\text{d}}{\di #1} } % derivative operator
\newcommand{\dyd}[2][y]{ \dfrac{\di #1}{\di #2} } % derivative of y w.r.t. x, (ex. \dyd{x} or \dyd[g]{t}).
\newcommand{\bracks}[1]{ \left( #1 \right) } % scaled left and right brackets
\newcommand{\pfrac}[2]{\left(\frac{#1}{#2}\right)} % scaled fraction with left/right brackets
\newcommand{\tpfrac}[2]{\left(\tfrac{#1}{#2}\right)} % tiny fraction with left/right brackets
\newcommand{\abs}[1]{\left| #1 \right|} % scaled fraction with left/right brackets
\newcommand{\norm}[1]{\left\| #1 \right\|} % scaled fraction with left/right brackets
\newcommand{\abracks}[1]{\langle #1 \rangle} % angled l/r brackets for vectors
\newcommand{\cbracks}[1]{\left\{ #1 \right\}} % scaled curly l/r brackets 
\newcommand{\sbracks}[1]{\left[ #1 \right]} % scaled square l/r brackets 
% $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ %

% $$$$$$$$$$$$$ CUSTOM SYMBOLS $$$$$$$$$$$$$$ %
\newcommand{\R}{\mathbb{R}} % Real numbers
\newcommand{\infnums}{1,2,\ldots}

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% $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ %

\makeatletter
\fancypagestyle{mypagestyle}{%
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  \def\headrule{{\if@fancyplain\let\headrulewidth\plainheadrulewidth\fi
    \color{red}\hrule\@height\headrulewidth\@width\headwidth \vskip-\headrulewidth}}
  \renewcommand{\footrulewidth}{0pt}%
}
\makeatother
\pagestyle{mypagestyle}

\begin{document}

\maketitle

\pagenumbering{gobble}
\maketitle % Create the title page first.
{
  \hypersetup{}
  \parskip 0pt
  \tableofcontents
} % Table  of contents next. 
\newpage
\pagenumbering{arabic}
\pagestyle{mypagestyle}

\subfile{Chapters/chap6.tex}

\subfile{Chapters/chap7.tex}

\subfile{Chapters/chap8.tex}

\subfile{Chapters/chap9.tex}

\subfile{Chapters/chap10.tex}

\subfile{Chapters/chap11.tex}

\end{document}