TeXworks ⇒ How to recall the equation (1)?

[yaozhao]

Code: Select all

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\begin{equation}MR=MC\end{equation}
 
 
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Suppose this is the equation (2). In the article, I want to say, (2) can give us ......

How to recall (2)?

Maybe "recall" is not a good word here. Maybe retrieve?

Many thanks in advance!

[Stefan Kottwitz]

It's called referencing, and done by \label (to set a marker) and \ref or \eqref to reference that marker.

Code: Select all

Code, edit and compile here:

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\documentclass{article} 
\usepackage{amsmath}
\begin{document}
\begin{equation}
  \label{anotherone}
  x = 2y
\end{equation}
\begin{equation}
  \label{myformula}
  MR=MC
\end{equation}
\eqref{myformula} can give us...
\end{document}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Run LaTeX here

Stefan

[yaozhao]

Hi Stefan,

I used your codes. But when I refer, LaTeX gives me (??).

Code: Select all

Code, edit and compile here:

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\documentclass[a4paper, 12pt]{article}  
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage[T1]{fontenc}    
\usepackage{graphicx}
\DeclareUnicodeCharacter{202F}{\,}
In this way, we have the following equation in a perfectly competitive market:
\begin{equation}\label{MR=P}MR=P\end{equation}
Remember, \eqref{MR=P} only holds in perfectly competitive market because price is only fixed in this type of market.\\
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Run LaTeX here

[Stefan Kottwitz]

Run LaTeX two times. First time it reads all labels, the second time it inserts references.

Stefan