{math-operators} is about operators in math mode. These include sums, integrals and similar, text operators like sin, cos, etc.

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141
votes
8answers
59k views

What's the proper way to typeset a differential operator?

I can't seem to find any consensus on the right way to typeset a differential operator, whether it is: in a standalone context: as part of a derivative: as part of an integral: In all of these ...
97
votes
7answers
116k views

Command for argmin or argmax?

How can you get the argmin or argmax in Latex? Two solutions I found are: \underset{x}{\operatorname{argmax}} \DeclareMathOperator*{\argmin}{arg\,min} Any other ideas? [1] ...
92
votes
3answers
36k 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 ...
89
votes
4answers
6k views

Spacing around \left and \right

Why does the addition of a \left and \right introduces an extra space around the formula? Specifically, why do $\cos(\theta)$ and $\cos\left(\theta\right)$ render differently? Is there a way to use ...
65
votes
3answers
15k views

What is the difference of \mathop, \operatorname and \DeclareMathOperator?

One sees all kind of versions in source files for defining something like a limit etc. So my question is which one serves what purpose. Is there any "best practice" in chosing one over the other?
65
votes
3answers
23k views

newcommand vs. DeclareMathOperator

As far as I understand, whatever can be done using DeclareMathOperator can also be achieved using newcommand, but not the other way around. If this is the case, what are the circumstances where ...
60
votes
6answers
16k views

Define additional math operators to be typeset in roman

Mathematical operators, such as function names, should be set in roman type, not italics. Latex already has commands for some operators, including \max, \min, and \log. How can I define additional ...
46
votes
3answers
74k views

How to add text under symbol in equation ?

I was trying to make something like this (something similar to \substack in \sum) in equation. How to do this ?
39
votes
8answers
2k views

How can I specify a long list of math operators?

The preambles of my LaTeX documents often include many many lines of \DeclareMathOperator instructions, e.g. \DeclareMathOperator{\Rep}{Rep} \DeclareMathOperator{\Tet}{Tet} ...
34
votes
5answers
10k views

How to present a vertical multiplication/addition

How do I present vertical (columnar) multiplication and addition in LaTeX. Like this: http://mathworld.wolfram.com/LongMultiplication.html 3 8 4 x 5 6 --------- 2 3 0 4 1 9 2 0 --------- 2 ...
32
votes
3answers
3k 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 ...
30
votes
3answers
85k views

How to do the 'curvy L' for Lagrangian or Laplace Transforms?

I am new to TeX, working on it for about 2 months. Have not yet figured out how to script the 'curvy L' for Lagrangian and/or for Laplace Transforms. As of now I am using the 'L' - which is not good! ...
27
votes
3answers
805 views

How can I write something above and below the signs?

I have a relation called Likelihood Ratio Test which has a special format. As you see in the picture, there are two non-equality signs and also somethings above and below them. How can I write these ...
22
votes
2answers
926 views

how can I create the negation of mathcal letters

I know that the negation of < is got by \not <. The same with many symbols. But this doesn't work with mathcal letters for example, like \not \mathcal{R} or \mathcal{\not R}.
22
votes
2answers
629 views

Typeset assigments +=, -= etc nicely?

Could someone please show me how to get LaTeX to properly typeset the -=, += assignment operators. I have tried $a -= 1$ $a\texttt{-=}1$ $a\verb!-=!1$ but they all look really ugly. I have been ...
22
votes
1answer
30k views

Expression under summation on multiple lines [duplicate]

Possible Duplicate: Separate long math text under sum symbol into different lines? I want to write expression \sum_{i=0}^n i with i\neq 4 under the summation symbol. How can I write this?
22
votes
2answers
19k views

double perpendicular symbol (for independence)

I found from http://jblevins.org/notes/latex that I could use the independence symbol: \newcommand\independent{\protect\mathpalette{\protect\independenT}{\perp}} ...
21
votes
6answers
842 views

How to change color of operators (lim, log, etc.)?

How can I change the color of operators like "log", "lim" or the root symbol of \sqrt command?
20
votes
2answers
5k views

Lower and upper Riemann integrals?

How can I make an integral symbol with a bar above it or a bar below it?
20
votes
2answers
1k views

is there a way to write −= as one symbol in formulas

In programming -=, += and other similar operators are quite popular. But I am unable to write such operator nicely in Latex equations. For example when I use x += \frac{\partial C}{\partial x} I get ...
20
votes
2answers
306 views

Defining arithmetic operators that insert brackets according to usual precedence rules

I have a program that generates bits of Tex code like these: $\product{a}{\add{b}{c}}\leftrightarrow \add{\product{a}{b}}{\product{a}{c}}$ $\add{a}{\add{b}{c}}\leftrightarrow \add{\add{a}{b}}{c}$ ...
19
votes
5answers
741 views

Brackets around a sum that has no top limit

MWE: \documentclass[12pt]{article} \usepackage{amsmath} \begin{document} \thispagestyle{empty} \[ \mathcal{F} \left\{ \sum_j e^{-2i\pi\nu_j t} \right\} \] \end{document} Result: The sum only ...
19
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 ...
19
votes
1answer
61k views

LaTeX adjusting \sum limits

is there a way to show \sum limits partially in inline mode and partially in display mode? i.e., I want to write \begin{equation} \sum_{n=-\infty}^{+\infty} [...] \end{equation} but this way the ...
18
votes
5answers
3k views

How to create my own math operator with limits?

How can i write my own math operator with limits? I want it to look like: \sum\limits_{e=1}^{m} but with a capital A (if possible bigger than the normal text) instead of the sum. Thanks for the ...
18
votes
2answers
10k views

Getting the expectation symbol to behave like $\sum$ instead of $\Sigma$

How can I get an expectation symbol which behaves like $\sum$? Specifically, I want the underscore to be like that of a summation. At the moment I use $$\mathbb{E}_{x\in A}$$ However, I do not ...
18
votes
1answer
990 views

Load integral sign from eulervm

I want to write a book for university and I want to have the "german" integral symbol in it. I tried using mathabx and wasysym but I don't like them. But I like the integral symbol in eulervm. How do ...
17
votes
2answers
483 views

How do I make customized $\sum$ operator?

How can I create the following symbols? \circlearrowleft or \circlearrowright centered in \sum operator. EDITED: So, In \usepackage{esint} package, \ointclockwise and \ointctrclockwise; how to ...
17
votes
2answers
507 views

How do you create .+?

I would like to display a = b .+ 1 But it is displayed as a = b. + 1 (moves . next to b).
17
votes
7answers
13k views

Average integral symbol

Is there in LaTeX a symbol or a macro for the average integral with a horizontal slash? I know about \strokedint, but I'd prefer the dash to be horizontal.
17
votes
1answer
1k views

Making a unary operator out of a binary operator or relation symbol

Often in physics, the symbol \sim is used as a unary operator to mean "approximately." For example, one might say "the energy of these processes is $\sim 4$ eV." However, this looks awkward because ...
16
votes
4answers
2k views

Swap definition of starred and non-starred command

I don't like the fact that I am required to use \abs* when I want the vertical line of the absolute value to automatically re-size. I pretty much always want it to re-size, so would like to swap the ...
16
votes
2answers
9k 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 ...
16
votes
1answer
859 views

Customized summation symbol

I am interested in defining some customized math symbols out of existing ones. For example I would like to distinguish between different types of sums, so beside the usual symbol I would like to ...
16
votes
1answer
267 views

Operators with subscripts, superscripts, and accents

In mathematics, the tensor product between two vector spaces U and V is often notated U ⊗K V, if the scalar field is called K. This is usually typed in TeX like U\otimes_K V. I wonder if this is ...
15
votes
3answers
516 views

How could LaTeX replace the tokens <= by the command \leq?

How could LaTeX replace the tokens <= by the command \leq efficiently? Example 1: I have this code: \[ 2x <= 4x - 2 \] And I want to get after the compilation this: Example 2: \[ ...
15
votes
2answers
398 views

Replace all instances of * with \cdot only in mathmode

As i understand the most accepted form to write the multiplication symbol in LaTeX in \cdot. However i have a rather large document already with * as the multiplication operator. I would like to ...
15
votes
4answers
4k views

Spacing between triple vertical lines

I would like to create a norm-like operator with 3 verticals bars instead of two. It has to look like $|||\cdot|||$. I would like to know how to decrease the spacing between the vertical bars such ...
15
votes
5answers
3k views

How do I put a circle around an operator?

For example, I want to put a circle around \land, just like one can put a circle around + by writing \oplus. Is there a general method to do this?
15
votes
3answers
253 views

Printing the first N terms from a telescoping series

I would like to produce a LaTeX document that generates the first N terms of the telescoping series sum(1/k-1/(1+k)) where k=1,2,3...,N, such that it displays at least the first 10 terms. I want the ...
15
votes
3answers
503 views

Typesetting the square of a mathematical operator

Assume I want to typeset the square of some mathematical operator A. Using \operatorname (amsmath package), there are basically two ways to do that: \(\operatorname{A^{2}}\) (i.e., the exponent is ...
15
votes
2answers
2k views

Phantom width of binary operator

Using beamer. Let's say I want to write A+B but with the plus invisible in one slide and visible in the next one. I think I read somewhere that more space is left normally around the + for being a ...
15
votes
1answer
242 views

How can I use German umlauts in DeclareMathOperator?

I would like to define a math operator Homöo, but when I try \DeclareMathOperator{\Homoo}{Homöo} \DeclareMathOperator{\Homoo}{Hom\"oo} I get Homo. How can I use German umlauts in ...
14
votes
4answers
477 views

Creating a circled operator which expands into a lozenge

I have a LaTeX document which has a binary operator called "composition". Normally, this is written as a circled letter, where the letter is passed as a parameter: \comp{x}. I can achieve good results ...
14
votes
2answers
10k views

How do I write $\sim$ approximately with the correct spacing?

I would like to use the symbol $\sim$ as "approximately". e.g: \documentclass{minimal} \begin{document} There are $\sim 10^{80}$ atoms in the universe. \end{document} I think that I need to declare ...
14
votes
2answers
15k views

\int with \limits or without?

I read that I can use \int_a^b or \int\limits_a^b. With \limits, the equation looks more compact horizontally, but a little bigger vertically. Is there some design rule to it, or just personal ...
14
votes
1answer
1k views

R-Integral symbol for my notes

I am typing up a set of notes for the Riemann Stieltjes integral. For reasons beyond the scope of the question, I would like to start with defining the Darboux's integral and then formulate Riemann's ...
14
votes
1answer
2k views

How to redefine a command using \DeclareMathOperator

I'd like to declare some new operators using \DeclareMathOperator and some of the names are already taken by other commands (that I do not want to use). Is there an equivalent to the \renewcommand ...
14
votes
1answer
4k views

Correct way to typset esssup (essential supremum)

What is the correct way to typeset essential supremum, with the limits underneath the operator? My first try was \operatorname{ess}\sup\limits_{x\in[0, 1]}, but this puts the x\in[0, 1] under the sup ...
14
votes
4answers
30k views

How do you write “times”? [duplicate]

I come from Norway, and here the formatting of maths are a little bit different than in the U.S. and the UK. If you want to factorize 25, you know that it is 5 times 5. How would you write this with ...