\numberwithin{equation}{section}
and
\renewcommand{\theequation}{\arabic{section}.\arabic{equation}}
and also
\documentclass[graybox,envcountsec]{svmult}
Nothing works!
\numberwithin{equation}{section}
\renewcommand{\theequation}{\arabic{section}.\arabic{equation}}
\documentclass[graybox,envcountsec]{svmult}
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