thismath.sty

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{thismath}

% Custom theorems 
\theoremstyle{plain}
\newtheorem{theorem}{Theorem}[chapter]
\newtheorem*{theorem*}{Theorem}
\newtheorem{task}{Task}[section] % Environment for exercises
\newtheorem{lemma}[theorem]{Lemma}
\newtheorem*{lemma*}{Lemma}
\theoremstyle{definition}
\newtheorem{example}[theorem]{Example}
\newtheorem*{example*}{Example}
\newtheorem{definition}[theorem]{Definition}
\newtheorem*{definition*}{Definition}
\theoremstyle{remark}
\newtheorem{remark}[theorem]{Remark}
\newtheorem*{remark*}{Remark}
\newenvironment{solution}{\begin{proof}[Solution]}{\end{proof}} % Environment for solutions of tasks

% Highlighted versions of definition and theorem
\tcolorboxenvironment{definition}{
    colback=blue!5!white, 
    arc=2mm,  enhanced, frame hidden, oversize,
    left=2mm,right=2mm,top=1mm,bottom=1mm}
\tcolorboxenvironment{theorem}{
    colback=blue!5!white, 
    arc=2mm,  enhanced, frame hidden, oversize,
    left=2mm,right=2mm,top=1mm,bottom=1mm}

% mathematics helpers
\newenvironment{smallpmatrix}{\left(\begin{smallmatrix}}{\end{smallmatrix}\right)}
\newcommand{\abs}[1]{\left|#1\right|}
\newcommand{\bC}{\mathbb{C}} % Complex numbers
\newcommand{\bN}{\mathbb{N}} % Natural numbers
\newcommand{\bR}{\mathbb{R}} % Real numbers
\newcommand{\norm}[1]{\left\|#1\right\|} % Norm
\renewcommand{\aa}{\mathbf{a}}
\newcommand{\bb}{\mathbf{b}}
\newcommand{\cc}{\mathbf{c}}
\newcommand{\ee}{\mathbf{e}}
\newcommand{\ff}{\mathbf{f}}
\renewcommand{\gg}{\mathbf{g}}
\newcommand{\hh}{\mathbf{h}}
\newcommand{\rr}{\mathbf{r}}
\newcommand{\uu}{\mathbf{u}}
\newcommand{\vv}{\mathbf{v}}
\newcommand{\ww}{\mathbf{w}}
\newcommand{\xx}{\mathbf{x}}
\newcommand{\yy}{\mathbf{y}}
\newcommand{\zz}{\mathbf{z}}
\newcommand{\aalpha}{\boldsymbol{\alpha}}
\newcommand{\bbeta}{\boldsymbol{\beta}}
\newcommand{\eepsilon}{\boldsymbol{\epsilon}}
\newcommand{\littleo}[1]{o(#1)}
\newcommand{\nn}{\mathbf{n}} % Normal