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In some countries one use comma as decimal separator instead of a dot.
I ususally use:
%%%% Une vrai virgule pour les décimaux
\DeclareMathSymbol{@}{\mathord}{letters}{"3B}
and $3@2$ to obtain 3,2
instead of $3,2$ that gives 3, 2 <- a uggly useless space after comma
I just find this :
\math...