amssymb is a LaTeX package to provide access to the extra mathematics symbols of the fonts from the AMS (American Mathematical Society)

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minus sign in mathematical typing

i can't have a minus sign in this "equation": thanks \documentclass[french,12pt,oneside,openright]{memoir} \usepackage[utf8]{inputenc} \usepackage[T1]{fontenc} \usepackage{lmodern} ...