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MA1511/decls.tex

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+\documentclass[fleqn]{article}
+\usepackage{amsmath,amssymb}
+\usepackage[margin=0.25in]{geometry}
+\usepackage{enumitem}
+\usepackage{systeme}
+\usepackage{mathtools}
+
+\date{}
+\author{}
+
+\newcommand{\paren}[1]{\left(#1\right)}
+\renewcommand{\Re}[1]{\operatorname{\mathbb{R}e}\paren{#1}}
+\renewcommand{\Im}[1]{\operatorname{\mathbb{{I}}m}\paren{#1}}
+\newcommand{\C}{\mathbb{C}}
+\newcommand{\N}{\mathbb{N}}
+\newcommand{\Z}{\mathbb{Z}}
+\newcommand{\Q}{\mathbb{Q}}
+\newcommand{\R}{\mathbb{R}}
+\newcommand{\conj}[1]{\overline{#1}}
+\renewcommand{\mod}[1]{\left|#1\right|}
+\newcommand{\abs}[1]{\left|#1\right|}
+\newcommand{\polar}[2]{#1\paren{\cos{\paren{#2}} + i\sin{\paren{#2}}}}
+\newcommand{\adj}[1]{\operatorname{adj}#1}
+
+\makeatletter
+\renewcommand*\env@matrix[1][*\c@MaxMatrixCols c]{%
+  \hskip -\arraycolsep
+  \let\@ifnextchar\new@ifnextchar
+  \array{#1}}
+\makeatother
+
+
+% https://gitlab.com/jim.hefferon/linear-algebra/-/blob/master/src/sty/linalgjh.sty
+\newlength{\grsteplength}
+\setlength{\grsteplength}{1.5ex plus .1ex minus .1ex}
+
+\newcommand{\grstep}[2][\relax]{%
+   \ensuremath{\mathrel{
+       \hspace{\grsteplength}\mathop{\longrightarrow}\limits^{#2\mathstrut}_{
+                                     \begin{subarray}{l} #1 \end{subarray}}\hspace{\grsteplength}}}}
+\newcommand{\repeatedgrstep}[2][\relax]{\hspace{-\grsteplength}\grstep[#1]{#2}}
+
+\newcommand{\swap}{\leftrightarrow}
+
+% https://tex.stackexchange.com/a/198806
+\makeatletter
+\newcommand{\subalign}[1]{%
+  \vcenter{%
+    \Let@ \restore@math@cr \default@tag
+    \baselineskip\fontdimen10 \scriptfont\tw@
+    \advance\baselineskip\fontdimen12 \scriptfont\tw@
+    \lineskip\thr@@\fontdimen8 \scriptfont\thr@@
+    \lineskiplimit\lineskip
+    \ialign{\hfil$\m@th\scriptstyle##$&$\m@th\scriptstyle{}##$\hfil\crcr
+      #1\crcr
+    }%
+  }%
+}
+\makeatother