# Tagged Questions

{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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### 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 ...
38k 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 + \...
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### 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 ...
85k 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}
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### 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 &...
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### 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 ...
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### 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(-...
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### How to number the letters of a sentence?

I need to number the letters of a sentence consecutively. Every letter should have the corresponding small number centered below it (see image below). Does anybody know how to do this? I tried \...
38k 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*}{...
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### 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]{...
18k views

### Multiple Alignment in equations

The following equations need to be aligned in two spots. If I use the align* environment then the second column of alignment is pushed to the right edge of the page. I googled this and saw that ...
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### Flexible equation, align, multline environment

I'm looking for a command (say \foo{}) or pair of commands (say \foos, \fooe) that behave like: equation environment if there is no \\ nor & multline if there is a single \\ align if there are ...
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### 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 ...
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### What is the difference between \notag and \nonumber in align environment?

I use \notag or \nonumber in align environment but there seems no any difference when display. What is the difference between these two commands?
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### 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 }...
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### 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 ...
137k 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 ...
7k views

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 ...
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### 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 \\ \...
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### Multiline equation with LHS alone on first line?

I would like my multiline equations to look like this: Left-hand-side of my equation = right-hand-side number 1 = right-hand-side number 2 = etc. I know there is a simple way to do this,...
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### 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 ...
2k views

### Automatic line break in alignat

Consider the following example from http://tex.stackexchange.com/a/12782/4011 \documentclass{article} \usepackage{amsmath} \newcounter{eqn} \renewcommand*{\theeqn}{\alph{eqn})} \newcommand{\num}{\...
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### 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 ...
13k 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 ...
31k 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 ...
37k 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*} ...
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### Stacked symbol doesn't align properly. Why?

A modified equals sign used represent use of L'Hopital's Rule isn't aligning well with other equals signs. How would I fix that? I'd prefer to do so without manually fiddling with spaces, if possible. ...
15k views

### Change font size of an align environment

In a document, I'd like to change the font size of a single align environment (not globally throughout the document). What is the proper way to do this? I've been using Preceding paragraph. {\tiny ...
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### Two column align environment with one line spanning both columns

Is there a good/correct way of making an align environment with one line spanning multiple columns? At the moment I'm using a hack like the following, but I feel that it's probably not the best way. ...
46k 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} \...
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### Aligning polynomial terms

In LaTeX align, I'm struggling to align polynomial terms and assume there's an easy way to do it. But I cannot find the simple/elegant solution. What I would like is something like this: x1 + x2 ...
16k views

### amsmath align environment: row spacing

How can I stretch the spacing between consecutive lines in an align* environment? I have a few lines with \fracs in which both the numerator and the denominator consist of textual phrases, not math ...
2k views

### How to align nested cases?

Please consider the code bellow: \begin{align*} function = \begin{cases} case1 &\mbox{if } n = 0 \\ \begin{cases} case2 &\mbox{if } n = 1 \\ ...
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### Split expressions with parentheses in align environment

I am writing down a rather long expression, which has to be splitted in a align environment. The thing is that this expression has parentheses which have to be splitted too. I don't want to use ...
3k views

### Make align* number the last equation

I am using the align* environment to write equations expanding several lines. I would like to define a command sequence in the preamble, such that the last equation of this block will always be ...
796 views

### align vs. equation: Which way is typograpically preferred?

The main differences between align and equation are the spaces and that align cannot be used with split, as far as I know. What would be, from a typographic point of view, the preferred practice? ...
42k 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{array}{lcl} \mathcal{L}^...
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### How to make formulae take equal vertical space in the align environment?

Consider the following code: \begin{align} f_1(x) &= \frac{15x}{3} \\ f_2(x) &= 3x + 5 \\ f_3(x) &= 4x + 13 \end{align} This produces three lines where the first line takes up more ...
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### Make sin the same width as cos

I am trying to typeset a two-line formula, where the top and the bottom are almost identical. The differences are the signs (plus to minus) and the trig-functions (\sin to \cos). I want most of the ...
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### Center one equation of many in align?

I have the following align enviroment: \documentclass[12pt]{memoir} \usepackage{amsmath} \begin{document} Here we see \begin{align} \text{cat} &= \text{dog}\\ \text{dog} &= cute \intertext{...
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### Custom pagebreak in align equation

I got the following problem: Right now I am checking my equations, which are usually written in align. This looks great in most of the cases, but sometimes the pagebreaks are weird, ie there is a lot ...
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### 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 ...
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### Correct usage of \ifmmode

Seems that there is some subtlety in using \ifmmode that I am not aware of. For some reason, using: \newcommand{\hlcodeA}[1]{\ifmmode\else\small\fi\texttt{\hilight{#1}}}% is not quite identical to:...
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### 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 ...
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### Two sets of aligned equations in two columns?

Say I have a set of equations: (1) \begin{align} wx&=u\\ wy&=v\\ w&=10 \end{align} (2) \begin{align} x&=u/w\\ y&=v/w\\ \end{align} How can I do the following: put (1) and (2)...
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### How to align the term to right

\documentclass[a4paper,titlepage]{article} \usepackage{amsmath,amssymb} \newcommand*{\PartialConj}{\ensuremath{\bar{\partial}}} \newcommand*{\Abs}[1]{\ensuremath{\left\lvert #1\right\rvert}} \begin{...
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### How do I get this strange alignment?

I would like to get a nonstandard alignment in the following code: \begin{align} \text{First left hand side} & = \text{First right hand side} \\ \text{Second left hand side} & = \text{...