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Questions tagged [align]

{align} is an environment provided by math packages that permits multiple related equations to be aligned at a common reference point, usually a sign of relation. For general questions about aligning document elements, use {horizontal-alignment} or {vertical-alignment} instead.

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194
votes
5answers
422k views

eqnarray vs align

Motivation I want to include a list of related equations, say, for a proof, in my LaTeX document. As far as I know, I have two good options, eqnarray and align. Question What is the difference ...
158
votes
5answers
113k views

What are the differences between $$, \[, align, equation and displaymath?

I once learnt, that it is uncool to use $$, but why is that? Why does \[ not act as a abbreviation to \begin{align}? I noticed, that there is a difference, since one cannot use & and \\ inside a ...
29
votes
6answers
22k views

Vertical alignment of align* in enumerate

Related (but not the same): Align number from enumerate with equation Displaying an equation in a list Earlier today I asked a question about aligning equations in an enumerate environment and ...
15
votes
2answers
15k views

Using \left( & \right) around amsmath's align delimiter (“&”)

I want to align equations (using the align environment from the amsmath package) inside matching \left( and \right) commands. For example: \documentclass[a4paper,12pt]{article} \usepackage{amsmath} ...
14
votes
2answers
41k views

Enumerate formulas

I'm writing a math paper in LaTeX and for math formulas I'm just using $$math formula$$. Is is possible to numerate formulas? Or do I have to you use some specific commands such as align?
125
votes
4answers
104k views

How to get only one vertically centered equation number in align environment with two equations

What I have are two equations with align and I want one single equation number to refer to this system of equations. To illustrate, I have \begin{align} dr_t &= \kappa ( \theta - r_t ) dt + \...
36
votes
1answer
54k views

How can I add left aligned text to an equation?

I have a document I am trying to copy to learn TeX. Here is what I have encountered: How can I have the "or" in the equation. This is what I have right now: \[ f = ma; \] But $a$ is the change in ...
29
votes
4answers
4k views

How can I break an align environment for a paragraph?

I would like to have two displayed equations, broken by a short paragraph, but with aligned equal signs (as if using the align environment). Is there some way to "break" the align environment ...
128
votes
4answers
143k views

align* but show one equation number at the end

I am using align*, but I still need an equation number. I know one solution is to use align and add \nonumber to all lines but the last. Is there a 'lazy' way to do it? I searched a little and found ...
38
votes
4answers
37k views

Remove vertical space around align

I need to display math in my report, but is it possible to remove the vertical space around align*? A little example is the following (where I just want the align* to have the same vertical space as ...
30
votes
3answers
115k views

How can I use an align environment flush left?

Is there a way possible to imitate the align environment for math mode commands, without having all writing being placed toward the center on the output page? MWE: \documentclass{article} \...
26
votes
1answer
203k views

How to left align a set of equations

I wanted to left align a set of equations. I've tried the solution provided in aligning to the left. It worked. But, I wanted to have a single equation number for the entire flalign in order to refer ...
3
votes
3answers
5k views

Aligning equations with left and right comment

I'd like to align multiple equations below each other such that the central operator is always centered, but have a column for commenting on the right and a column for \iff-arrows and \Rightarrow-...
15
votes
2answers
935 views

What is wrong with defining \bal as \begin{align}?

I'm trying to define two commands \bal and \eal instead of inserting \begin{align} and \end{align} in my document, but in the code below, I'll get some errors. What is wrong with it? \documentclass{...
12
votes
1answer
1k views

How to split and align equations when they are inside an enumerate environment?

How to make the first line of aligned equations sit in the same baseline as the bullet and make the equation left justified? \documentclass{article} \usepackage{amsmath} \begin{document} \begin{...
89
votes
8answers
339k views

How to align a set of multiline equations

I am trying to align a set of long equations, that are themselves align environments as most of them are spreading on multiple lines. Currently I just have a sequence of align environments, with ...
18
votes
1answer
689 views

What's the right space to right the alignment of a right aligned align environment?

As Hilbert would have put it, had he lived in the TeX-era: No one shall expel us from the Paradise that AMS has created. and one aspect of that paradise is release from the tyranny of eqnarray by ...
169
votes
4answers
235k views

Show equation number only once in align environment

I want the equation number to be shown only at the last line, or better, somewhere in the middle of all. So instead of (1), (2), ... only (1). I use \begin{align} ... \end{align}
47
votes
1answer
76k views

Aligning equations with text with alignat

I'm trying to add this expression to my work: I understand that the best way to achieve this is using the alignat environment within the amsmath package, so I tried the following: \begin{alignat*}{3}...
54
votes
5answers
377k views

Align equation left

Here is my split equation: \documentclass{article} \usepackage{amsmath} \begin{document} \begin{equation} \begin{split} a_{ijk} =& \frac {Pr(M_{I} =2 \& M_J=1 \& M_K =1 | I=i , J=j , K=...
18
votes
1answer
9k views

Blank lines in align environment

Is there a way to insert a blank line between two equations in align environment? From what I understand a blank line is interpreted as \par and \par is not allowed in align. Can I disable this "...
25
votes
2answers
11k views

Highlight an equation within an align environment

I would like to define a command that puts a red box around an equation with yellow highlighting. I have the basics working pretty well. What I am unable to figure out is: How to keep the alignment ...
18
votes
3answers
16k views

Aligning across 'aligned' equation blocks

I'd like to format two groups of equations such that all their equal signs line up and such that I can put a big brace to the right of each block to annotate that block. The last part is easily ...
13
votes
2answers
2k views

newenvironment: error with \begin{align} and \end{align}

In the example below, an error is caused by \begin{align} and \end{align} but I do not see why: \documentclass{book} \usepackage{amsmath} \newenvironment{subalign}{\begin{subequations}\begin{align}}{\...
11
votes
1answer
230 views

Measuring align

From what I read it seems that align environments are processed twice: the first time for measuring, the second time for actual typesetting. My question is whether one can get access to these ...
31
votes
5answers
66k views

How to correctly format (and align) a LaTeX proof?

I'm new to LaTeX and I'm trying to figure out how to correctly format a proof. Can someone show me a basic template for how to do this? The part I am having the most trouble with is creating new ...
52
votes
3answers
27k views

Centering \vdots in a system of many equations

I have a system of equations with an arbitrary number of equations (k). I'd like to use \vdots to compactly describe the system, like so: \begin{align*} R(-1) &= \sum_{i=1}^m A(i)R(i-1) \\ R(-...
20
votes
2answers
26k views

Equations inside enumerate aligned on item's number

If I type \begin{enumerate} \item \begin{align*} eqn 1 eqn 2 \end{align*} \end{enumerate} the label will appear on the first lines and the equations will ...
9
votes
1answer
4k views

Spurious space above align environment at top of page/minipage

It seems that the align environment adds additional vertical space if it starts at the top of a page or minipage. Below are two pages, and two minipages (on Page 1), where the first page/minipage has ...
19
votes
2answers
10k views

Align Equations Over Multiple Tabular Rows

I'm trying to set up a table with some equations in it, however I would like the equations on multiple rows to be aligned properly. So far I have \begin{tabular}{cc} \hline \multicolumn{1}{l}{Header ...
28
votes
3answers
74k views

Use flalign or alignat or align or similar environment to align to the left

The following is a small example to use flalign environment to generate equation. \documentclass{article} \usepackage{amsmath} \usepackage{txfonts} \begin{document} The formula is: \begin{flalign*} ...
34
votes
4answers
69k views

side-by-side equations, with equation numbers for each

The align command from amsmath allows me to put two equations side-by-side: \begin{align} x = y && a = b \end{align} Unfortunately for my purposes, this shows both equations under one ...
15
votes
5answers
28k views

problem using option fleqn in amsmath package

I'm using the following code. What should I do if I don't want the fixed indent from the left margin of my page? ‎ \documentclass[‎fleqn,oneside‎]{article}‎ ‎\usepackage{amsmath}‎ .... \begin{align} ...
14
votes
3answers
2k views

Numbering a set of horizontally distributed equations

Having different horizontally distributed equations inside an align environment, only lines are numbered, but not individual equations. How can the left equations be numbered using subequations? ...
6
votes
2answers
9k views

Can I tab inside of align environment?

I currently have this ugly equation: The green alignment is just like I want it. The Red one is what I would like to get, but I don't know how. Here is my MWE: \documentclass[a4paper]{scrartcl} \...
78
votes
4answers
29k views

What does a double ampersand (&&) mean in LaTeX?

I've seen several answers that use the double ampersand, but I can't figure out exactly what it does. I tried this out: \begin{align*} \frac{3x + y}{7} &= 9 & \text{given} \\ 3x + y &...
44
votes
4answers
116k views

Aligned equations in LaTeX

I have a long equation in LaTeX, which I need to break up into more lines. I've done this, although its not quite what I was looking for. Here is a MWE showing my problem: \documentclass[10pt]{...
28
votes
2answers
13k views

What's the difference between align and align*?

After some brief searching I can't find the difference between align and align*. Google summarily ignoring the * is making it harder I think. Can you tell me the difference between these two? ...
23
votes
3answers
9k views

Alignment of equals sign in multiple align environments

I have multiple align environments in my document, separated by a small paragraph of text: \begin{align*} foo &= something very very long compared to the other align \end{align*} explanation ...
10
votes
3answers
8k views

How can I number a few equations together

i would like to write few equations, but all the equations will get only once numbered and in the middle (right side) of the equations. e.q. if i write 3 equations, the number will be to the right of ...
10
votes
3answers
14k views

\left and \right in equation across multiple lines [duplicate]

Possible Duplicate: Left/Right across multiline equation Could someone explain why I can't get the left and right commands to work correctly code: \documentclass{article} \usepackage{amsmath} \...
5
votes
1answer
3k views

some \newcommand instructions not working

I have created some new short command using \newcommand in the following example: \documentclass[12pt,twoside,a4paper]{book} \usepackage{enumerate,amsmath} \newcommand{\ba}{\begin{array}} ...
13
votes
2answers
2k views

Selective numbering of equations with align

I have an align environment with 5 equations. I want 3 of them numbered, and the other 2 not numbered. I understand that there's other posts on the issue of selective numbering of those equations that ...
61
votes
2answers
64k views

Multiple alignment

In the following piece of code \begin{align*} [x \mapsto s]x &= s \\ [x \mapsto s]y &= y \qquad \text{als } y\neq x \\ [x \mapsto s](\la{y}t_1) &= \la{y}[x \mapsto s]t_1 \qquad \text{als }...
37
votes
2answers
136k views

Align multiline equation with expression after equal sign

I am trying to align a multiline equation using array within the equation but it turns out it doesn't do very well. The code I am using is as follows: \begin{equation} \begin{array}{lcl} \mathcal{...
16
votes
1answer
8k views

AMS align / Align multiple “=”, too much space

I asked this question at stackoverflow and have been kindly redirected here. I'd like to align some equations in Latex using the AMS packages. Each equation has two equal signs that need to be ...
31
votes
1answer
18k views

Uncover lines of an align environment with beamer

Is there any way to uncover equation-lines of an align* environment line per line in a frame conveniently? somethink like \begin{align*}[<+->] a &= b \\ b &= c \\ \...
12
votes
4answers
27k views

How to align multiple subfigures in a grid?

I have three images and I want to align them in the way that one image is above the other two. Here's an example: How can I achieve this? For my other figures I use the subcaption package, but I am ...
35
votes
2answers
56k views

How to put the QED symbol of a proof at the right place inside align?

When a proof ends with a formula in equation or equation* environment, putting \qedhere after the equation would cause the QED symbol to appear in the right place. I.e. at the end of the line in which ...
19
votes
2answers
6k views

Nesting subequations within align

subequations seems to only work outside environments such as align and equation. What if I want to preserve the alignment of the equal signs using align while also would like subequations numbering ...