feat: 1522 l1 notes

ma1522/preamble.tex

@@ -0,0 +1,55 @@
+\usepackage{amsmath, amsthm, amssymb, amsfonts}
+\usepackage{thmtools}
+\usepackage{graphicx}
+\usepackage{setspace}
+\usepackage{geometry}
+\usepackage{float}
+\usepackage{hyperref}
+\usepackage[utf8]{inputenc}
+\usepackage[english]{babel}
+\usepackage{framed}
+\usepackage[dvipsnames]{xcolor}
+\usepackage{tcolorbox}
+
+\colorlet{LightGray}{White!90!Periwinkle}
+\colorlet{LightOrange}{Orange!15}
+\colorlet{LightRed}{Red!15}
+\colorlet{LightGreen}{Green!15}
+
+\newcommand{\HRule}[1]{\rule{\linewidth}{#1}}
+
+\declaretheoremstyle[name=Theorem,]{thmsty}
+\declaretheorem[style=thmsty,numberwithin=section]{theorem}
+\tcolorboxenvironment{theorem}{colback=LightGray}
+
+\declaretheoremstyle[name=Proposition,]{prosty}
+\declaretheorem[style=prosty,numberlike=theorem]{proposition}
+\tcolorboxenvironment{proposition}{colback=LightOrange}
+
+\declaretheoremstyle[name=Principle,]{prcpsty}
+\declaretheorem[style=prcpsty,numberlike=theorem]{principle}
+\tcolorboxenvironment{principle}{colback=LightGreen}
+
+\declaretheoremstyle[name=Note,]{notesty}
+\declaretheorem[style=notesty,numbered=no]{note}
+\tcolorboxenvironment{note}{colback=LightRed}
+
+\setstretch{1.2}
+\geometry{
+    textheight=9in,
+    textwidth=5.5in,
+    top=1in,
+    headheight=12pt,
+    headsep=25pt,
+    footskip=30pt
+}
+
+\newcommand\hr{
+    \noindent\rule[0.5ex]{\linewidth}{0.5pt}
+}
+
+\newenvironment{amatrix}[1]{%
+  \left(\begin{array}{@{}*{#1}{c}|c@{}}
+}{%
+  \end{array}\right)
+}