\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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Learn LaTeX easily with newest books:
The LaTeX Beginner's Guide: 2nd edition and perfect for students writing a thesis
The LaTeX Cookbook: 2nd edition full of practical examples for mathematics, physics, chemistry, and more
LaTeX Graphics with TikZ: the first book about TikZ for perfect drawings in your LaTeX thesis