{math-mode} is about typesetting mathematical content, e.g. tweaking the appearance of spacing and symbols in a formula, or producing specific mathematical constructs. For questions about "wrapper" environments like equation or align, consider the tag {equations}.

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3
votes
1answer
6k views

“!Missing $ inserted” error using amsmath environments

I am trying to compile a document with equations but whenever I use \begin{eqnarray}..\end{eqnarray} or \begin{align}...\end{align} or anything like this I get the error msg !Missing $ ...
3
votes
2answers
815 views

Stealth arrow in math?

Is there an easy way to produce stealth style arrows in normal math mode? By "stealth" I'm thinking of TikZ stealth arrowhead. Something like \rightarrowstealth? The question originates from a limit ...
1
vote
2answers
140 views

How to write a mathematical formula in 2 lines?

I have a mathematical formula with many symbols and Greek characters, but it is too big. So I want to split it in two lines. I use \\ between $, but it doesn't work. Does anybody know how to fix it?
6
votes
2answers
483 views

How can I draw a dot under a symbol in math mode?

I'm trying to find the equivalent to \d (or \textsubdot) for the math mode.
4
votes
1answer
389 views

Typing Following notation in Latex [duplicate]

I need to generate following notation in LaTeX. It's used in differential geometry to denote vector fields. I can't find documentation and detexify is not helpful either.
76
votes
3answers
29k 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 ...
28
votes
3answers
22k views

Bold math: Automatic choice between \mathbf and \boldsymbol for Latin and Greek symbols?

This is a follow-up to this question. Suppose you want to denote vectors by upright bold letters; then \mathbf{u} works fine, except that if it's a Greek letter you have to use \boldsymbol{\omega} ...
28
votes
2answers
3k views

Drawing a hypergraph

What is the proper way to draw a hypergraph? Is there a package to do this, or is there an easy way to draw such diagrams with a common drawing method like tikz? I'm trying to draw something like
11
votes
2answers
49k views

Dot notation for derivative of a vector [closed]

If I want to use the dot notation for the time derivative of a vector is better (more common) to put the dot over the vector, or the other way around \dot{\vec{v}} \vec{\dot{v}} The first says ...
23
votes
1answer
437 views

Sloppy \left and \right?

The \left and \right commands often produce improvidently large delimiters. It almost always looks better to use delimiters that are just slightly too small than delimiters that are too large. With ...
35
votes
1answer
44k views

How to color math symbols?

One can use the command such as \textcolor[rgb]{1.00,0.00,0.00}{boundary} to color the word "boundary" in a document. Here is my question: How to color the math symbols in $$? For example, can one ...
6
votes
1answer
1k views

How can I add some enhancement to the matrix [duplicate]

Possible Duplicate: Highlight elements in the matrix \documentclass[12pt,a4paper]{mwrep} \usepackage{amsmath} \usepackage[nodisplayskipstretch]{setspace} \setstretch{1.5} \begin{document} ...
33
votes
5answers
4k views

How to automatically resize the vertical bar in a set comprehension?

I have a simple command which I use to write set comprehensions so that the braces automatically resize with respect to size of the enclosed arguments, e.g. \usepackage{amsmath} ...
27
votes
4answers
5k views

Numbers outside Math environment

Should numbers inside the text be placed inside a math environment? For example, if I am writing ...indent code by 4 spaces..., should I write it this way or ...indent code by $4$ spaces...? ...
24
votes
4answers
14k views

Bold italic vectors

I am trying to display vectors as bold and italic. The command \mathbf sets the letters non-italic. I also googled a bit and stumbled upon \mathbf{\em y} or \mathbfit{y}, which all didn't work. I ...
15
votes
1answer
1k views

Which version of LaTeX permits more than 16 alphabets?

Sometimes I receive a message: ! LaTeX Error: Too many math alphabets used in version normal. I know that there is a limit of 16 alphabets at most allowed to one article. However this message ...
13
votes
4answers
3k views

What is the correct way to do delimiters?

I've always used \left and \right with my delimiters, but Martin Heller's answer to another question indicates that this method gives incorrect spacing. The correction appears to be prepending ...
12
votes
2answers
829 views

How to make a traditional division

How to make the traditional division? Like that: a |b_ r c
26
votes
1answer
20k views

Difference between \textrm{} and \mathrm{}

Can you explain me what is the difference between \textrm{} and \mathrm{} when they are used in math mode. In what context one is preferred over the other?
24
votes
3answers
5k 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 ...
18
votes
5answers
16k views

Typeset mathematical symbols also in sans serif font?

For creating the graphics for my thesis (function graphs, flow charts, line art sketches) I've chosen to use the sans serif font by \renewcommand\familydefault{\sfdefault} However when I use ...
10
votes
4answers
5k views

Coding an equation with description

I want to code this equation in LaTeX: I'd like to know how to code the equation and the description below it with a reference as well.
10
votes
1answer
1k views

How to organize labels when there are too many equations?

I'm writing a moderately long text using LaTeX, and it's great to be able to organize chapters, sections, appendices, and everything else almost automatically. One thing has been bothering me though. ...
10
votes
2answers
10k views

A lateral brace to group a set of equations with labels

I have a set of equations that I'd like to display together (as an example, the Maxwell's equations). Requirement #1: I'd like to have them labelled like in an align environment \begin{align} ...
15
votes
2answers
8k views

Limits under multiple \sum

I would like to place a lower limit under two consecutive \sums, somewhere in between. So I have \sum_{j=1}^{\infty}\sum_{k=1}^{\infty} and would like to place j>k in the lower limit between the ...
15
votes
4answers
5k views

Intertext vertical spacing

How do I reduce the vertical spacing of \intertext?
13
votes
1answer
2k views

How do I create the negated arrow on \xrightarrow?

Say I have $x\xrightarrow{\rm mb}y$ as in the first line below, but I want a negation symbol like the one defined in \nrightarrow, as in the second line, but extendable. Does anyone know how I can do ...
12
votes
2answers
6k views

How to get a vertical bar which is longer than \mid ?

sometimes when writing mathematical expression with partial derivatives, one needs to write a vertical bar afterwards and write the value at the which the partial derivatives are being computed as ...
11
votes
2answers
815 views

Preventing \MakeUppercase from affecting mathematics

Is there a way to prevent \MakeUppercase from affecting in-text equations? In this example, abc should change to ABC, but n should be left as it is. \documentclass{article} \begin{document} ...
5
votes
2answers
2k views

Underbraces in Matrix Divided in Blocks

How to put underbraces, inside the parenthesis of a matrix, to name both sides of the blocks? \documentclass[a4paper,12pt]{article} \usepackage{amsmath} \usepackage{array} \begin{document} . . . \[ ...
17
votes
1answer
6k views

How To Change Math Font Only?

I'd like to keep my text in Helvetica as usual but would like to have my equations and formulas in Roman or MT Extra. So far, I've tried using different packages but that changes both the text and the ...
15
votes
7answers
1k views

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 ...
13
votes
3answers
17k views

Supremum of the infimum

Consider the following snippet: $$\text{d}_{H}(A,B) = \max\left\{ \sup_{a\in A} \inf_{b\in B} \text{d}(a,b),\sup_{b\in B} \inf_{a\in A}\text{d}(a,b)\right\}$$ In the output, the text under the ...
12
votes
6answers
613 views

Typesetting 144…4 with “n times” under the 4's is easy, but what about \sqrt{144…4}?

Inspired by this question on the math StackExchange, suppose you want to typeset the square root of the number 144...4, that is, 1 followed by n 4's. If you write $\sqrt{1\underbrace{44\ldots4}_{n\ ...
11
votes
3answers
2k views

How to create vertical and horizontal dotted lines in a matrix?

Similar to this question, I am trying to output a similar matrix with dotted line instead of dashed line. Is there anyway to do this? I also try to use these three packages: ...
10
votes
2answers
3k views

Force line break inside a \lim argument in align environment

Inside an align environment I have a \lim with two variables which should be displayed in two lines: \begin{align} ... f & = \lim _ {a \rightarrow -\infty \linebreak b \rightarrow \infty} ... \\ ...
6
votes
2answers
659 views

How to number each equation of simultaneous equations grouped by a left curly brace? [duplicate]

Consider the following MWE. \documentclass[preview,border=12pt,varwidth]{standalone} \usepackage{amsmath} \begin{document} \abovedisplayskip=0pt\relax \begin{equation} \begin{cases} ax + by =c \\ px ...
16
votes
2answers
417 views

Why does \widehat behave differently if I insert \hspace{0pt}?

I am getting some inexplicable behaviour from \widehat: \documentclass[12pt,a4paper]{article} \usepackage{amsfonts} \begin{document} \[ \fbox{$\widehat{\mathcal{C}}$}, ...
11
votes
1answer
884 views

How can I make an overset symbol at the same size and height as \bar except with a different symbol?

Apologies for the cryptic title, but I was not sure how best to phrase the question in one sentence. I am essentially trying the create a vector symbol with \rightharpoonup as the top instead of the ...
11
votes
2answers
2k views

Exchange meaning of : and \colon

I usually use the colon symbol : to denote maps. For set syntax there is the braket package. So as the spacing of : is not appropriate, I want it to behave like \colon. I tried ...
8
votes
4answers
527 views

How to construct a long equation that is split in LHS and RHS to occupy a narrow column?

I have a homework document using 2-column article document class as follows. \documentclass[twocolumn]{article} \usepackage[a4paper,margin=1cm]{geometry} \usepackage{amsmath} \begin{document} ...
8
votes
2answers
2k views

Coloured math in beamer

I have a question: Is there any way to have math (everything between $s) in different colour than text (for example, green) in beamer?
7
votes
2answers
841 views

What is \mathchoice?

Can someone give me a detailed starters' guide to \mathchoice? I was trying to define commands for underscript and overscript (which I have found out to exist and be called \underset and \overset), ...
6
votes
2answers
5k views

How to put something at the top of the \longrightarrow?

I would like to put something at the top of the \longrightarrow, something like \longrightarrow^{k\rightarrow\infty}. However, instead of putting k\rightarrow\infty on the top right corner, I would ...
15
votes
1answer
173 views

\( \) don't work with TOC?

If i write this line of code \subsection{Ranger \( n \) boules distinguables dans \( M \) boîtes} I obtain an error over the second \) (./Probabilité.toc ./Probabilité.toc:8: LaTeX Error: Bad ...
15
votes
3answers
1k views

mathop shifts the baseline, DeclareMathOperator doesn't

Here is a little example that illustrates this strange behaviour: \documentclass{article} \usepackage{amsmath} \DeclareMathOperator\foo{\mathbf{l}} \begin{document} ...
14
votes
1answer
372 views

\ifmmode doesn't seem to work correctly inside an array environment

I’m struggling with getting \ifmmode to work correctly when used inside an array environment which is inside a displaymath environment. Here is a minimal example: \documentclass{article} ...
12
votes
4answers
1k views

Can I get $$…$$ to behave like \[…\]?

Is it possible to modify LaTeX so that good old $$...$$ behaves like \[...\] (and by this I mean that it should be synonymous to it). If yes: Dear LaTeX3 developer, please integrate this into LaTeX3! ...
12
votes
5answers
3k views

Define strange operators

I' looking for a symbol rendering the connected sum of $n$ topological spaces (or other quite strange topological operations) in a "product-like" manner... What For example in writing $$ ...
9
votes
1answer
2k views

siunitx: Bold single numeric cells

I'm struggling to make a single numeric cell in an siunitx table bold. (A similar question for making a whole column bold is available here.) I want to define a simple macro which I can set for the ...