How do you make numbered equations in latex?

Question

I would like to put in a code that automatically assigns a number to the equations in my documents preferably aligned on the right hand side.

How can I go about this?

\documentclass[a4paper,11pt]{article}
%\documentclass[a4paper,11pt]{scrartcl}
\usepackage{amsmath} 
\usepackage[utf8]{inputenc}

\begin{document}

$$\ddot{\underline{\mathbf{r}}} = \frac{d{^2}\underline{\mathbf{r}}}{dt^2}= 0$$. 
\end{document}

has this question really not been asked before? – Vivi Oct 08 '12 at 01:31 — Vivi, Oct 08 '12 at 01:31

score 55 · Accepted Answer · edited Jun 10 '20 at 12:32

55

You can use display math environment such as equation:

enter image description here

Notes:

The d in dt should be upright as d is an operator, not a variable. Have defined a macro for that and corrected it below.

References:

You should not use a the TeX way of using a $$ to enter display math. See Why is \[ ... \] preferable to $$ ... $$?
An excellent reference for math mode is Herbert Voss' comprehensive review of mathematics in (La)TeX.

Code:

\documentclass{article}
\newcommand{\dd}[1]{\mathrm{d}#1}
\begin{document}
\begin{equation}
\ddot{\underline{\mathbf{r}}} = \frac{\dd{}{^2}\underline{\mathbf{r}}}{\dd{t}^2} = 0
\end{equation}
\end{document}

edited Jun 10 '20 at 12:32

Community

1

answered Oct 08 '12 at 00:13

Peter Grill

223,288

3

I think we don't need the trailing s in Voss's. – kiss my armpit Oct 08 '12 at 02:02
@ガベージコレクタ: Have corrected that. – Peter Grill Oct 08 '12 at 03:15
1

“See Why is \[...\] prefereable to $$”; yeah, especially Harrold's and Hendrik's comments to the accepted answer. – morbusg Oct 08 '12 at 03:18
@morbusg: Thanks for pointing those comments out. Perhaps those should be added as an answer so that thy are not missed. But, then David Carlisle's answer about $$ not easily being re-definable might be a better reason. – Peter Grill Oct 08 '12 at 03:22
2

@kissmyarmpit nothing wrong with a trailing s there. perfectly acceptable according to conventional grammar. – abcd Oct 23 '15 at 20:58

score 22 · Answer 2 · edited Jun 08 '17 at 23:50

22

You can also use the align environment:

\documentclass[a4paper,11pt]{article}
%\documentclass[a4paper,11pt]{scrartcl}
\usepackage{amsmath} 
\usepackage[utf8]{inputenc}

\begin{document}
%Equations with numbering
\begin{align}
\ddot{\underline{\mathbf{r}}} &= \frac{d{^2}\underline{\mathbf{r}}}{dt^2}\\
                              &= 0
\end{align} 

%Equations with no numbering in specific line by using \nonumber
\begin{align}
\ddot{\underline{\mathbf{r}}} &= \frac{d{^2}\underline{\mathbf{r}}}{dt^2}\nonumber\\
                              &= 0
\end{align}

%Equations without numbering
\begin{align*}
\ddot{\underline{\mathbf{r}}} &= \frac{d{^2}\underline{\mathbf{r}}}{dt^2}\\
                              &= 0
\end{align*} 
\end{document}

enter image description here

edited Jun 08 '17 at 23:50

David Carlisle

757,742

answered Oct 08 '12 at 00:16

azetina

28,884

That is not working for me.EDIT sorry I didn't notice those \ after the equation. – Magpie Oct 08 '12 at 00:23
1

@Magpie Is everything working fine now? – azetina Oct 08 '12 at 00:29
Yes, I was just having a sloppy moment. Thanks for your help. I selected the other answer because it does what I want more precisely but I appreciate your solution too. – Magpie Oct 08 '12 at 00:35
1

How can I reference those lines then? – Minh Nghĩa Sep 29 '20 at 03:07
2

@MinhNghĩa label with the command \label{ } then reference with \ref{ } – azetina Sep 29 '20 at 03:30

How do you make numbered equations in latex?

2 Answers2

Notes:

References:

Code:

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