We want the equation number to be (1.1)(2.4) in different sections in stead of (1)..(4), add

`\numberwithin{equation}{section}`

`before \begin{document}, don't forget loading the amsmath package`

If we want to start a equation number from a specified number, use:

`\setcounter{equation}{3}`

or

\addtocounter{equation}{1}

If we want the style: (1-1), (2-4), use:

`\renewcommand{\theequation}{\arabic{section}-\arabic{equation}}`

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