{symbols} is about specific non-alphabetic symbols or math symbols, e.g., about looking-up, constructing, or using symbols. For questions about {fonts} or alphabetic {characters} use the respective tag instead.

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23
votes
1answer
31k views

Mapsto vs. rightarrow

This is perhaps half a math question and half a typesetting one. In what circumstances do I use \mapsto and when \rightarrow? I feel like the standard seems to be: when you're specifying the operator ...
18
votes
1answer
24k views

Text over/under implies arrow?

I'm currently trying to write over/under an implies arrow in LaTeX (in math mode): \implies_{text} This places the text lower, but next to the arrow, not below it. How can I get it below the arrow?...
13
votes
5answers
4k 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 $$ {\Large{*}}_{...
10
votes
3answers
2k views

How to use \bigtimes without pain

I've been fighting with mathabx lately and it's not really worth my time, so I tried switching to MnSymbol which also modifies some of my regular symbols. Is the best solution just to make my own ...
18
votes
1answer
9k views

Latex symbol for personal website url

I have a fancyhdr footer with my personal data and I would like to add some cute symbol inline with my website url. I've already included the marvosym package and used: \Letter symbol before my ...
15
votes
2answers
3k views

Extendible equals sign

I have a command that has been floating around in my standard preamble for a while: \newcommand{\xeq}[1]{\stackrel{\;#1}{\cleaders\hbox{=\!}\hfill}\:} It is meant to mimic the AMS-LaTeX extendible ...
12
votes
3answers
2k views

What is the symbol “between” (≬) used for?

The amssymb package has a binary relation symbol named \between, which I have never come across. What is it used for? I found out from a compiler error when I tried to define a symbol named that way ...
37
votes
7answers
41k views

Typesetting of negative versus minus?

I've occasionally seen a negative (when a number is simply negative, not a subtraction), typeset as negative sign that's slightly skinnier and above the centre line of text. Is this proper notation ...
17
votes
5answers
2k views

\Longrightarrow doesn't look good in 12pt

I'm using the standard CM fonts in 12pt (and amsmath if this is relevant). My problem is that \Longrightarrow gives something like this output, which I find a bit annoying. I know that it's a ...
6
votes
3answers
3k views

Problem with \leq displaying as \leqslant

I assume it has something to do with my custom macro package, but I'm not really sure. I've just noticed that all of my \leq display as \leqslant the only thing that I could think would effect it is ...
15
votes
7answers
18k views

A symbol for the quotient of two objects

One needs often a symbol to denote the quotient of two (algebraic) objects. (e.g. quotient by a subgroup, subring, submodule etc.). In simple cases people use A/B. But when both A,B are complicated to ...
10
votes
5answers
1k views

A symbol for the field of formal Laurent series

In my area of math one of the objects that pops up quite often is the field of all formal Laurent series. Now the trouble is that the notation for this field is $\mathbf{C} (( t ))$. Now the two ...
15
votes
2answers
8k views

The symbol for a map which is an isomorphism?

Suppose I have a map A → B which is an isomorphism. I'd like to represent this as something that looks like \rightarrow with \simunder it. I could try \underset{}_{}, but is there already a ready made ...
37
votes
5answers
20k views

What's a good way to write “x does not divide y”?

The way I currently do it is $x \not | y$, which looks awful. There's got to be something better available.
5
votes
2answers
1k views

Tone marks above Chinese characters in latex

My aim is to put tone marks above Chinese characters in latex. I have tried \v{好}, but this puts the carron accent (3rd tone) in the space left of the character rather than above it. I have also ...
8
votes
2answers
6k views

\chardef and underscore

Could you explain to me why a\_b {\ttfamily a\_b} \\ \chardef\_=`\_ a\_b {\ttfamily a\_b} produces ? I would like to have the short underscore in the normal text and the long one in fixed-...
103
votes
8answers
17k views

Prettiest way to typeset “C++” (cplusplus)?

Writing "C++" in plain text results in an ugly setting, as the '+' signs are too big and too spaced: I've seen around the web several marcos for typesetting the "C++" symbol, ranging from mild ...
68
votes
4answers
128k views

“inputenc Error: Unicode char \u8” error while trying to write a degree symbol (invisible character)

No matter how I try to do it I always get the following error : ! Package inputenc Error: Unicode char \u8:­ not set up for use with LaTeX. I have tried using ­­­$^{\circ}$, \deg, \textdegree, ...
127
votes
9answers
50k views

How to typeset $:=$ correctly?

I like to use $:=$ for "is defined to be equal to", but this is never typeset with the symmetry one would like, as the colon is always too low relatively to the equals sign. Is there any way of ...
12
votes
3answers
4k views

How to typeset Haskell ++ operator and friends?

Usually, the list concatenation operator in Haskell is printed as overlapping double plus signs in books. (In ASCII it is just ++) How can I typeset this sign in Haskell (in and perhaps outside of ...
3
votes
3answers
4k views

How can I put musical clefs in the middle of text?

I'm setting a document that includes some music; I'm using lilypond-book for the musical examples. However, there are some points where the author has inserted a musical symbol in the text; I'm using ...
7
votes
2answers
2k views

A big thick question mark

I'm using \ding{52} and \ding{56} from the pifont package to get nice satisfying thick ticks and crosses. I'd like a question mark ? that fits with these. \textbf{?} is too small, and not thick enough....
8
votes
4answers
2k views

\ell in MinionPro

Is it possible to use the \ell character from the default font when using MinionPro? If so, how? The documentation actually mentions \ell on page 20; the letter is supposed to be taken from MinionPro, ...
38
votes
6answers
41k 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 ...
26
votes
6answers
50k views

Logic operators in LaTeX? (XOR?)

When I google this, it seems that \XOR is how you would get an XOR symbol in LaTeX, however that is giving me the 'undefined control sequence' error. How does one get the xor symbol?
6
votes
2answers
7k views

overleftrightarrow

I'm not completely happy with the construction \overset\leftrightarrow{#1}. There is slightly too much spacing and the arrow heads are too big - making the line spacing a bit too much. Does anyone ...
3
votes
4answers
6k views

small integral delimiter

while reading a book on maths lately, I have seen a small integral delimiter such that, in what follows: \begin{equation} \sum_i^j A_{ij}\int\limits_{-\infty}^{+\infty} \cos x dx \end{equation} ...
16
votes
3answers
3k views

How can I create a full-size circumflex in typewriter font?

I have some C source code and would like to show the circumflex or caret (^) in the way it is typically shown in source code -- as a full-size character. The source code will be appearing in ...
6
votes
2answers
4k views

Bold square brackets

How do I typeset a bold square bracket? I need to typeset it about 3 times thicker than it is (to denote a specific mathematical operator). {\bf[} does not do this. Things like [\![ do not seem to ...
39
votes
4answers
36k views

Smileys in LaTeX

I would like to include smileys in my LaTeX document. Is there any package with lots of different smileys? In mnsymbol and wasysym, I found some general symbols: \documentclass{article} \usepackage{...
13
votes
2answers
2k views

How do I lower the \widetilde accent, i.e., move it closer to the variable?

I sometimes find that the \widetilde accents sits too high above the math letter it is applied to. An example: To me it looks as if the first tilde is sitting just in between the two lines; it is ...
6
votes
3answers
8k views

Is there a standard symbol for conditional independence?

I have found this symbol defined as: \def\ci{\perp\!\!\!\perp} on the wikipedia page for Conditional Independence. There's this from the Comprehensive LaTex Symbol List page 106: Donald ...
4
votes
2answers
618 views

How can I type the “EE” character?

I'm looking to type the "EE" character, the one that means "* 10^{x}" -- I'm trying to represent what might be typed on a Ti-84 calculator....
35
votes
4answers
31k 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} ...
6
votes
2answers
3k views

Symbol for contraction / interior product?

How to make the symbols for interior product (a.k.a. contraction)? The best I've been able to come up with is \mathrel{\llcorner} (or \lrcorner). Any other suggestions?
11
votes
5answers
1k views

Is there a readymade symbol for a 90 degrees rotated \Bowtie?

Where do I find a symbol that looks like a slightly smaller version of a 90 degrees rotated \Bowtie from the wasysym package? Something like . I couldn't find anything in the usual tables. The ...
19
votes
4answers
5k views

Blackboard bold variants for Greek letters

It is common (or it used to be) to use a blackboard-bold variant of \mu to denote roots of unity in some mathematical papers. However, despite searching (several times, periodically over several ...
6
votes
2answers
1k views

Create my own mapping for XeTeX fonts

I'm trying to create mapping files, to make use of Cambria Math italic calligraphic and double stroke letters in Plain XeTeX. However, I'm unable to do so. This is what I tried to create for the ...
14
votes
1answer
7k views

How to typeset block matrices?

I need to typeset a block matrix that is made of a 2X2 structure of blocks such that the (1,1) block and the (2,2) blocks are zero and the (1,2) and the (2,1) blocks are non-zero (and happen to have a ...
1
vote
1answer
3k views

Enhanced \oint to emphasize circulation

I'm looking for a symbol that merges \iint and \oint together (a dedicated package, if it could exist, would provide something like \oiint and \oiiint). The purpose of \oint is to show that the ...
22
votes
11answers
2k views

What useful web services are out there?

Looking at this question, I wonder what good and useful web services are out there. For example the LaTeX symbol classifier looks interesting. You can draw a symbol with your mouse and get back the ...
18
votes
3answers
3k views

How to indicate elision in a quotation?

How should one typeset an elided passage in a quote? An example: \begin{quotation} some text [...] then some more \end{quotation} Elision in a quote is usually indicated by an ellipsis (three ...
2
votes
1answer
702 views

Custom radical sign with plain XeTeX

I would like to use Cambria Math font in mathematical equation, and I have a simple problem here. plain TeX uses many symbols for the root sign, so it can use the proper one depending on context, ...
24
votes
2answers
21k views

How do I use a circle as a math accent (larger than \mathring)?

To denote the interior of a set, I'd like to have a command \interior. Now, as one can learn from this post, one possibility is to use \mathring. This is a neat command, but it produces a circle that ...
8
votes
3answers
18k views

Big \sum instead of small \sum in array environment

\begin{align*} \begin{array}{c} \min \: A = \min \: \sum_{i\in B} C_i \\ \ \min \: D = \min \: \sum_{i\in B} \pi_i \cdot F_i \end{array} \end{align*} How can I get i \in B below the \sum symbol ...
45
votes
2answers
45k views

\bm package versus \boldsymbol

I'm typing a bold vector small x with a tilde sign above it. Now when I want to write its derivative, I'm putting a dot on top of everything. This is giving me problems and I found one solution: \...
16
votes
2answers
11k 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 ...
2
votes
1answer
880 views

Changing the kpfonts \sum symbol

I like the kpfonts package. It's a nice font and some of the extra symbols it defines are sometimes useful. But I do not like the \sum symbol either in displaystyle or inline. It's too thin and too ...
17
votes
3answers
3k views

How do I change the font of a letter?

This is a partial re-asking of my question Can I change the font and colour of a letter permanently?. The answers there focussed on the colour aspect of what I wanted. I also want to be able to ...
5
votes
1answer
887 views

How do I convert a character to a numeric value?

Now that I've gotten Will Robertson's excellent unicode-math package working to change the colour and style of letters in my mathematics (trust me, there is a reason) thanks to his answer to my ...