{amsmath} is a package provided by AMS that enhances LaTeX's mathematical typesetting capabilities in various ways.

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80
votes
3answers
31k views

What's the difference between \mathrm and \operatorname?

I apparently can't see the difference in a compilation (pdflatex) between \mathrm and \operatorname. So, as in the title the question is: is there a difference? Which one is preferable in what ...
69
votes
4answers
13k 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 ...
68
votes
5answers
12k views

Is there a preference of when to use \text and \mathrm?

I'm unsure of when it is preferable to use \text versus \mathrm, is there some unwritten rule about the use of these? For example, I saw the following code in a math post: ...
60
votes
2answers
77k views

How can I get text underneath an underbrace?

I am looking to do something of the following: To get text underneath the underbrace. Is it involving \stackrel or some sort of similar command?
57
votes
6answers
24k views

How can I write multiple lines in a subscript?

Is there a way to force a line break inside a math mode text? My example: \[ \underbrace{....}_\text{Some long text that should be multiline} \] Trying \text{Some long text that\\ should be ...
52
votes
2answers
15k views

What does each AMS package do?

In my view, any document with a substantial amount of mathematics should load the packages from AMS-TeX. Hence, most of my document's preambles contain \usepackage{amsmath, amsthm, amssymb, amsfonts} ...
48
votes
3answers
44k 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 ...
44
votes
4answers
8k views

align vs equation

I always use align in my documents, and avoid equation. Is there anything wrong with that? My reasoning behind this: align > equation, so why not use it?
43
votes
2answers
25k views

Vertical Spacing within align environment accounting for fractions

The default vertical spacing within an align environment seems very tight when there are fractions in the lines. I am aware of three manual tweaks that can be applied: Adjust the value \jot. ...
41
votes
3answers
3k views

Which command should I use for displayed equations?

A number of related questions have already been asked about this issue: align vs equation which is preferable to what to do with this hyperref note on amsmath and even eqnarray vs align But I'm ...
40
votes
2answers
961 views

Why is there a \, space at the beginning of the “aligned” environment?

Near the beginning of the definition of the amsmath environments aligned and gathered (and also mathtools' multlined) there's an explicit thin space \,. This often has to be cancelled with \!, as ...
39
votes
2answers
30k views

What is the difference between \dfrac and \frac?

The title says it all, both \dfrac{a}{b} and \frac{a}{b} make fractions, so what is the difference between the two?
32
votes
6answers
32k views

Mathematical symbol for disjoint set union

In our lecture script, we use the notion of disjoint set union. It uses a special symbol to differentiate the disjoint from the usual set union, where we add an extra dot inside of the \cup symbol. Is ...
32
votes
5answers
16k views

A MiKTeX update removed amsmath as obsolete – can I use another package or get it back?

I have a problem with amsmath package. After an update this package was removed because it was obsolete. But what package can use instead of amsmath?
31
votes
4answers
6k views

Using display style fraction in a matrix environment

I'd like use the \dfrac command in a bmatrix environment as follows: \documentclass{article} \usepackage{amsmath} \begin{document} \[ \begin{bmatrix} \dfrac{\partial f}{\partial x} \\ ...
30
votes
3answers
8k 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) \\ ...
30
votes
2answers
890 views

Equation connected by lines

I have written a code that defines a new environment in which aligned equation are connected by lines as in the image: I think it is useful when, inside the align environment, there is the need of ...
29
votes
3answers
2k views

How are big operators defined?

I would like to create a new "big operator", by which I mean something like the Σ character used for summations. I know about the \DeclareMathOperator* command, which creates an operator whose ...
28
votes
4answers
2k views

Why do arguments to nested \tilde or \breve commands reappear when amsmath is used?

On LaTeX-Community.org I've noticed a strange problem with nested \tilde and \breve commands, when amsmath is used. In this code the X appears also in the output of the second and the third formula: ...
28
votes
1answer
6k views

Problem with qedhere

In a paper I'm writing, I end a proof with a displayed equation that has some cases in it. The relevant code looks something like the following: \[f(x) = \begin{cases} 2x & \text{if $x<0$}\ ...
24
votes
2answers
4k views

Difference of the \dots*

I came to wonder, what is the difference between the following? \dotsc \dotso As well as between: \dotsb \dotsi \dotsm
24
votes
3answers
6k views

\DeclareMathOperator won't take arguments

I'd like to define a family of math operators that have the same superscript, but different subscripts. My first attempt was: \DeclareMathOperator{\Upd}[1]{U^M_{#1}} But the log tells me that: l.3 ...
24
votes
1answer
448 views

Please explain a strange interaction between bytefield, unicode-math, and mathtools

bytefield gives me different results when used in association with mathtools and unicode-math when used together. Here's my 'good' MWE: % !TEX TS-program = XeLaTeX \documentclass[a4paper]{article} ...
23
votes
1answer
29k 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: ...
23
votes
2answers
6k views

How to use more than 10 tab stops in \bmatrix?

I'm using bmatrix environment from the amsmath package, and I'm trying to do something like this: \documentclass{article} \usepackage{amsmath} \begin{document} \begin{equation} ...
23
votes
1answer
5k views

mathtools vs amsmath

I read on http://en.wikibooks.org/wiki/LaTeX/Mathematics: The mathtools package fixes some amsmath quirks and adds some useful settings, symbols, and environments to amsmath. It sounds like ...
22
votes
3answers
20k views

Dot Derivative Discrepancy

I am trying to typeset some higher-order time derivatives using the dot notation, and I've noticed something strange. The expressions $\dot y + y = \cos(\dot y)$ $\ddot y + y = \cos(\dot y)$ give ...
22
votes
3answers
6k views

Guidelines for typesetting fractions

I realize that this question is to some extent subjective. However, I suspect that there are some common standards regarding how fractions ought to be typeset in mathematics. The guide Mathematical ...
22
votes
2answers
15k views

\xRightarrow (text)

I know it's possible to have \xrightarrow (text), but if I try to do \xRightarrow (text) I get an error each time. Does anybody know if it's a syntax error or if there is a other way to produce the ...
21
votes
5answers
2k views

Huge matrix in my document. Possible ways to make it look better?

The following is the source for a matrix I'm using in my document: \documentclass{scrartcl} \usepackage[english]{babel} \usepackage[T1]{fontenc} \usepackage[latin1]{inputenc} \usepackage{amsmath} ...
21
votes
4answers
1k 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 ...
21
votes
4answers
4k views

Separate labels in cases

As much as I have tried, it doesn't seem possible to use separate labels when using a casesconstruction (from the amsmath package). Ideally, I would like to be able to write something like ...
21
votes
2answers
8k views

\boxed{}, TikZ and colored equation background

I wonder if someone could provide me with a simple MWE for using TikZ together with \boxed to produce a colored equation background. If possible with rounded corners. I am using \boxed{} inside the ...
21
votes
1answer
8k views

\varnothing 'undefined control sequence'

I am using amsmath and all of my math symbols are appearing using $ $ block but \varnothing is undefined. \emptyset works but its symbol is a bit different than \varnothing Note: images taken from ...
21
votes
2answers
6k views

Is there a difference between the `displaymath` and `equation*` environments?

The amsmath documentation says Basic LaTeX doesn’t provide an equation* environment, but rather a functionally equivalent environment named displaymath. Are they really the same or is there a ...
20
votes
4answers
5k views

How to break a long expression in the denominator of a fraction?

I used the split command to break my equation but I receive the error: ! Missing } inserted. <inserted text> } l. \end {split} The code in .tex file is as follows: ...
20
votes
5answers
603 views

Conflict: onlyamsmath and TikZ

To force myself and collaborators to only use AMS-Math commands, I load this package in the preamble: \usepackage[all,warning]{onlyamsmath} However, when this is combined with TikZ, I get into ...
20
votes
3answers
5k views

Add equation name underneath equation number

I am wondering if it is possible (and if so how) to add names to equations just underneath the equation number. I am just using the standard equation environment to display the equation centered in ...
20
votes
1answer
6k views

Is there a left-handed equivalent of \implies?

I’m aware of and use the \implies and \iff commands to denote right-handed implication and if and only if (so A=>B and A<=>B). I’ve been looking for a similar command for left-handed implication ...
20
votes
1answer
6k views

Why does amsmath print a warning about a foreign command?

I was wondering what was the cause of the following warning message with the specific \usepackage used below: Using the following: Preamble \documentclass[amssymb,twocolumn,aps]{revtex4} ...
19
votes
4answers
2k views

Printing labels along with equation numbers

Working with documents with huge amount of equations it becomes cumbersome to go back and remind yourself what you labeled a certain equation to (I try to name them in a smart way, but there are too ...
19
votes
1answer
10k views

About big parenthesis larger than Bigg

Do any one know how to type a very big parenthesis in LaTeX. Since the formula is very big, I used multline environment, in one line, there are many pair of parenthesis by using \left and \right which ...
19
votes
3answers
2k views

How do magic \dots work in amsmath?

The amsmath package redefines the \dots command so that it "guesses" the correct height of the dots with respect to its context. For example $x, \dots, y$ will produce three lowered dots, aligned ...
19
votes
2answers
237 views

amsmath matrix vs loading the array package

Here is an interesting interaction. Consider the example below. Whenever the array package is loaded, extra space appears on the right in the output. Any ideas as to why? ...
19
votes
1answer
813 views

Why is \global\let not always global?

As an LaTeX environment opens a local group, it is normally necessary to use a global definition if changes in the environment should be available after the environment: \documentclass{minimal} ...
19
votes
1answer
2k views

Changing the apperance of equation numbers with amsmath

For equations in my document, I use the facilities of the amsmath package. In order to make the equation numbers more eye-catching, I want them to be in boldface and a little bit indented to the ...
18
votes
4answers
953 views

How to typeset an i with asterisk above?

I tried it with a modification of \overset as suggested by Werner in this question: Creating non-math mode substitutes for \overset and \underset not dependent on the amsmath package With the new ...
18
votes
4answers
1k views

What to do with this hyperref note on amsmath?

http://www.ctan.org/tex-archive/macros/latex/contrib/hyperref/ has this note copied below: amsmath ------------- The environments equation and eqnarray are not supported too well. For ...
18
votes
5answers
23k views

Real number symbol (UTF-8: ℝ) in XeTeX

How can I get the 'real number' sign (something like \mathbb{R} with the amssymb package in LaTeX) in XeTeX?
18
votes
2answers
4k views

How do I do a one-shot MathOperator?

The amsmath packages helpfully define a macro \DeclareMathOperator which does what it says on the tin: it declares a mathematical operator such as \sin or \Null or whatever and typesets it all nice ...