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I want to display the equation as (1) , (2), (3) and so on...... for one set of equations (section) and then I want to display the other set of equation (in another section) as (a), (b), (c), ...... and so on..... Is it possible to show both on the same document ?

In fact, I have a big document and I want to derive the expressions for different problems and for each problem or probably within one section I want to start from (1) , (2)..... and so on and on next section I again want to start the equations from (1), (2) and so on .

Please let me know if it is possible.

A sample equation is given as follows:

\begin{equation}
\frac{d^2 \bar{c}}{dx^2} - \frac{U}{D}\frac{d \bar{c}}{dx}- \frac{(p+K)\bar{c}}{D}=0
\end{equation}

Thanks.

2 Answers 2

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You can reset the equation counter

\setcounter{equation}{0}

at the beginning of each section.

Alternatively, you can use the amsmath package and the command

\numberwithin{equation}{section}
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At the start of one section you can go

\setcounter{equation}{0}
\renewcommand\theequation{\alph{equation}}

and in another

\setcounter{equation}{0}
\renewcommand\theequation{\arabic{equation}}

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