As I plant to use the following packages and commands, are there some obsolete ones :
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\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage{geometry}
\usepackage{ragged2e}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage{bbm}
\usepackage{cancel}
\usepackage{enumitem}
\usepackage{multicol}
\usepackage{pgfplots}
\usepackage{tikz}
\usetikzlibrary{plotmarks}Also, if I remeber well, you recommend the use of
empheq environment for equations. Generally, how to know when a package is obsolete except asking ?
