diff --git a/packages/macros.sty b/packages/macros.sty
index d7a6369..5d021eb 100644
--- a/packages/macros.sty
+++ b/packages/macros.sty
@@ -52,14 +52,16 @@
 \newenvironment{prop_sq}{\begin{mdframed}\begin{prop}}{\end{prop}\end{mdframed}}
 \newtheorem{corollary}{Corollaire}
 \newenvironment{corollary_sq}{\begin{mdframed}\begin{corollary}}{\end{corollary}\end{mdframed}}
-\newcommand{\norm}[1]{\lVert#1\rVert}
-\newcommand{\Norm}[1]{\lVert #1\rVert}
-\newcommand{\matrixnorm}[1]{\lVert#1\rVert}
+\DeclarePairedDelimiter{\generator}{\langle}{\rangle}
+\DeclareMathOperator{\subgroup}{\leqslant}
+\newcommand{\rank}[1]{\text{rg}(#1)}
+\DeclarePairedDelimiter{\norm}{\lVert}{\rVert}
+\DeclarePairedDelimiter{\Norm}{\lVert}{\rVert}
+\DeclarePairedDelimiter{\matrixnorm}{\lVert}{\rVert}
 \newcommand{\powerset}[1]{\mathcal{P}(#1)} % Power set
 \newcommand{\converges}{\rightarrow}
-\newcommand{\equivalence}{\Longleftrightarrow}
-\renewcommand{\implies}{\Longrightarrow}
-\newcommand{\Limplies}{\Longleftarrow}
+\DeclareMathOperator{\equivalence}{\Longleftrightarrow}
+\DeclareMathOperator{\Limplies}{\Longleftarrow}
 \newcommand{\impliespart}{\fbox{$\implies$}}
 \newcommand{\Limpliespart}{\fbox{$\Limplies$}}
 \newcommand{\subseteqpart}{\fbox{$\subseteq$}}