[Tex/LaTex] Equation numbers of different types within a same document

labels

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.

Best Answer

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}

Related Solutions

[Tex/LaTex] Referring to an equation in a different section

The best practice to label equations, chapter, section, images and tables is to use a labeling system like this:

\label{what:name}

with what you name the type you label, for example you can use equ for equations, cha for chapter, sec for section, fig for figures and images and tab for tables
with name you create a name that is easy to remember.

The complete label (what:name) should be unique: in your hole document there is only one such a label!

The advantage is, that you now can name everything to be easy located. For example, if you have an image of Einstein you label it \label{fig:einstein}, if you have the famous equation E=mc*c you can label it \label{equ:einstein} and if you have a table with calculated values for the equation you label it \label{tab:einstein}. Now all references exists only one time, but you can easy remember them.

Then it does not matter where in your document the labels are used. because they do exist only one time in your document (that's the trick with this best practice) you can refer to them where ever you need with \ref{fig:einstein} etc.

Your \label{6} has another disadvantage: Suppose your equation 6 has to be removed where it stood and to be added three pages later, now beeing equation 12. Be sure you will never remember this and your references will become incorrect. An label existing surely only one time is the best you can do and with good naming you can easy remember the label.

[Tex/LaTex] How to label a multi-line equation

I see no other sensible way than as follows:

\documentclass{article}
\usepackage{amsmath}

\newcommand{\bvar}[1]{\mathbf{#1}}
\newcommand{\bM}{\bvar{M}}
\newcommand{\bN}{\bvar{N}}
\newcommand{\bR}{\bvar{R}}

\begin{document}

\begin{align}
&\sup_{\bN}V_{\bN, S, \varphi}\langle S_{\bM, S, \bN, \varphi}(m+_{\bM}n)\rangle
\notag \\
&\qquad\geq_{\bN}\sup_{\bN}
  V_{\bN, S, \varphi}\langle S_{\bM, S, \bN, \varphi}(m)
  +_{\bR^{(S)}_{\bN, \varphi}} S_{\bM, S, \bN, \varphi}(n) \rangle
\label{eq:1}\\
&\qquad= \sup_{\bN}
  \bigl(V_{\bN, S, \varphi}\langle S_{\bM, S, \bN, \varphi}(m)\rangle
  +_{\bR^{(S)}_{\bN, \varphi}} V_{\bN, S, \varphi}
    \langle S_{\bM, S, \bN, \varphi}(n) \rangle
  \bigr)
\label{eq:2}\\
&\qquad\geq_{\bN} \sup_{\bN}
  \bigl(V_{\bN, S, \varphi}\langle S_{\bM, S, \bN, \varphi}(m)\rangle)
  +_{\bN} \sup_{\bN}(V_{\bN, S, \varphi}\langle S_{\bM, S, \bN, \varphi}(n) \rangle
  \bigr),
\label{eq:3}
\end{align}
Referencing eq.~\ref{eq:1}.

\end{document}

Best Answer

Related Solutions

[Tex/LaTex] Referring to an equation in a different section

[Tex/LaTex] How to label a multi-line equation

Related Question