Help:Displaying a formula

MediaWiki uses a subset of TeX markup, including some extensions from LaTeX and AMSLaTeX, for mathematical formulae. It generates either PNG images or simple HTML markup, depending on Preferences#Rendering_math and the complexity of the expression. In the future, as more browsers are smarter, it will be able to generate enhanced HTML or even MathML in many cases. (See blahtex for information about current work on adding MathML support.)

More precisely, MediaWiki filters the markup through Texvc, which in turn passes the commands to TeX for the actual Rendering (computer graphics)ing. Thus, only a limited part of the full TeX language is supported; see below for details.

Syntax

Math markup goes inside $...$ . The Edit toolbar has a button for this.

Similarly to HTML, in TeX extra spaces and newlines are ignored.

MediaWiki templates, variables and parameters cannot be used within math tags, see Template talk:Demo of attempt to use parameters within TeX.

Rendering

The PNG images are black on white (not transparent). These colors, as well as font sizes and types, are independent of browser settings or CSS. Font sizes and types will often deviate from what HTML renders. Vertical alignment with the surrounding text can also be a problem. The User style#CSS_selectors of the images is img.tex.

It should be pointed out that most of these shortcomings have been addressed by Help talk:Formula#Maynard_Handley.27s_suggestions, but have not been released yet.

The alt attribute of the PNG images (the text that is displayed if your browser can't display images; Internet Explorer shows it up in the hover box) is the wikitext that produced them, excluding the and .

Apart from function and operator names, as is customary in mathematics for variables, letters are in italics; digits are not. For other text, (like variable labels) to avoid being rendered in italics like variables, use \mbox or \mathrm. For example, $\mbox{abc}$ gives $\mbox{abc}$ .

TeX vs HTML

Before introducing TeX markup for producing special characters, it should be noted that, as this comparison table shows, sometimes similar results can be achieved in HTML (see Special characters).

TeX Syntax (forcing PNG)	TeX Rendering	HTML Syntax	HTML Rendering
$\alpha\,$	$\alpha\,$	`α`	α
$\sqrt{2}$	$\sqrt{2}$	`√2`	√2
$\sqrt{1-e^2}$	$\sqrt{1-e^2}$	`√(1−e²)`	√(1−e²)

The use of HTML instead of TeX is still under discussion. The arguments either way can be summarised as follows.

Pros of HTML

In-line HTML formulae always align properly with the rest of the HTML text.
The formula's background, font size and face match the rest of HTML contents and the appearance respects CSS and browser settings.

Pros of TeX

TeX is semantically superior to HTML. In TeX, " $x$ " means "mathematical variable $x$ ", whereas in HTML "x" could mean anything. Information has been irrevocably lost.
TeX has been specifically designed for typesetting formulae, so input is easier and more natural, and output is more aesthetically pleasing.
One consequence of point 1 is that TeX can be transformed in HTML, but not vice-versa. This means that on the server side we can always transform a formula, based on its complexity and location within the text, user preferences, type of browser, etc. Therefore, where possible, all the benefits of HTML can be retained, together with the benefits of TeX. It's true that the current situation is not ideal, but that's not a good reason to drop information/contents. It's more a reason to help improve the situation.
When writing in TeX, editors need not worry about whether this or that version of this or that browser supports this or that HTML entity. The burden of these decisions is put on the server. This doesn't hold for HTML formulae, which can easily end up being rendered wrongly or differently from the editor's intentions on a different browser.

Functions, symbols, special characters

\tilde{a} \quad \breve{a} \quad \check{a} \quad \bar{a} \ddot{a} \quad \dot{a}

\tilde{a} \quad \breve{a} \quad \check{a} \quad \bar{a}

\ddot{a} \quad \dot{a}

\sec e \ \csc f \arcsin k \ \arccos l \ \arctan m \sinh g \ \cosh h \ \tanh i \ \coth j \operatorname{sh}\,g \ \operatorname{argsh}\,k \operatorname{ch}\,h \ \operatorname{argch}\,l \operatorname{th}\,i \ \operatorname{argth}\,m \lim n \ \limsup o \ \liminf p \min q \ \max r \ \inf s \ \sup t \exp u \ \ln v \ \lg w \ \log x \ \log_{10} y \ker x \ \deg x \ \gcd x \ \Pr x \det x \ \hom x \ \arg x \ \dim x

\sec e \ \csc f

\arcsin k \ \arccos l \ \arctan m

\sinh g \ \cosh h \ \tanh i \ \coth j

\operatorname{sh}\,g \ \operatorname{argsh}\,k

\operatorname{ch}\,h \ \operatorname{argch}\,l

\operatorname{th}\,i \ \operatorname{argth}\,m

\lim n \ \limsup o \ \liminf p

\min q \ \max r \ \inf s \ \sup t

\exp u \ \ln v \ \lg w \ \log x \ \log_{10} y

\ker x \ \deg x \ \gcd x \ \Pr x

\det x \ \hom x \ \arg x \ \dim x

a \bmod b

a \bmod b\,\!

(Square symbols may not work for some wikis) \in \ni \not\in \notin \subset \subseteq \supset \supseteq \cap \bigcap \cup \bigcup \biguplus \setminus \; \smallsetminus

\in \ni \not\in \notin \subset \subseteq

\supset \supseteq \cap \bigcap \cup \bigcup \biguplus

\setminus \; \smallsetminus

\sqcap \sqcup \bigsqcup

\sqcap \sqcup \bigsqcup

\times \; \otimes \; \bigotimes \cdot \; \circ \; \bullet \; \bigodot \; \star \; * / \; \div \; \begin{matrix} \frac{1}{2} \end{matrix}

\times \; \otimes \; \bigotimes

\cdot \; \circ \; \bullet \; \bigodot \; \star \; *

/ \; \div \; \begin{matrix} \frac{1}{2} \end{matrix}

\lor \; \vee \; \bigvee \; \lnot \; \neg q

\lor \; \vee \; \bigvee \; \lnot \; \neg q

\le \; < \; \ll \; \gg \; \ge > \equiv \; \not\equiv \; \ne \mbox{or} \neq \; \propto

\le \; < \; \ll \; \gg \; \ge \; >

\equiv \; \not\equiv \; \ne \mbox{or} \neq \; \propto

\; \mid \; \nmid \; \| \; 45^\circ\; \mid \; \nmid \; \| \; 45^\circ(Harpoons may not work for some wikis) \leftrightarrow \; \longleftarrow \; \longrightarrow \mapsto \; \longmapsto \hookrightarrow \; \hookleftarrow \nearrow \; \searrow \; \swarrow \; \nwarrow \uparrow \; \downarrow \; \updownarrow

\leftrightarrow \; \longleftarrow \; \longrightarrow

\mapsto \; \longmapsto

\hookrightarrow \; \hookleftarrow

\nearrow \; \searrow \; \swarrow \; \nwarrow

\uparrow \; \downarrow \; \updownarrow

\; \leftharpoonup \; \leftharpoondown \; \upharpoonleft \; \upharpoonright \; \downharpoonleft \; \downharpoonright\; \leftharpoonup \; \leftharpoondown \; \upharpoonleft \; \upharpoonright \; \downharpoonleft \; \downharpoonright\Longleftarrow \; \Longrightarrow \Longleftrightarrow (or \iff) \Uparrow \; \Downarrow \; \Updownarrow

\Longleftarrow \; \Longrightarrow

\Longleftrightarrow (or \iff)

\Uparrow \; \Downarrow \; \Updownarrow

\ldots \smile \frown \wr

\ldots \; \smile \frown \wr

\vdash \vDash \Vdash \models \lVert \rVert

\vdash \vDash \Vdash \models \lVert \rVert

\Re \; \Im \; \wp \; \complement

\Re \; \Im \; \wp \; \complement

\Game \; \flat \; \natural \; \sharp

\Game \; \flat \; \natural \; \sharp

Subscripts, superscripts, integrals

Feature	Syntax	How it looks rendered
Feature	Syntax	HTML	PNG
Superscript	a^2	$a^2$	$a^2 \,\!$
Subscript	a_2	$a_2$	$a_2 \,\!$
Grouping	a^{2+2}	$a^{2+2}$	$a^{2+2}\,\!$
Grouping	a_{i,j}	$a_{i,j}$	$a_{i,j}\,\!$
Combining sub & super	x_2^3	$x_2^3$
Preceding sub & super	{}_1^2\!X_3^4	${}_1^2\!X_3^4$
Derivative (forced PNG)	x', y, f', f\!		$x', y$ , f', f\!
Derivative (f in italics may overlap primes in HTML)	x', y, f', f	$x', y$ , f', f	$x', y$ , f', f\!
Derivative (wrong in HTML)	x^\prime, y^{\prime\prime}	$x^\prime, y^{\prime\prime}$	$x^\prime, y^{\prime\prime}\,\!$
Derivative (wrong in PNG)	x\prime, y\prime\prime	$x\prime, y\prime\prime$	$x\prime, y\prime\prime\,\!$
Derivative dots	\dot{x}, \ddot{x}	$\dot{x}, \ddot{x}$
Underlines, overlines, vectors	\hat a \ \bar b \ \vec c	$\hat a \ \bar b \ \vec c$
	\overrightarrow{a b} \ \overleftarrow{c d} \ \widehat{d e f}	$\overrightarrow{a b} \ \overleftarrow{c d} \ \widehat{d e f}$
	\overline{g h i} \ \underline{j k l}	$\overline{g h i} \ \underline{j k l}$
Overbraces	\begin{matrix} 5050 \\ \overbrace{ 1+2+\cdots+100 } \end{matrix}	$\begin{matrix} 5050 \\ \overbrace{ 1+2+\cdots+100 } \end{matrix}$
Underbraces	\begin{matrix} \underbrace{ a+b+\cdots+z } \\ 26 \end{matrix}	$\begin{matrix} \underbrace{ a+b+\cdots+z } \\ 26 \end{matrix}$
Sum	\sum_{k=1}^N k^2	$\sum_{k=1}^N k^2$
Sum (force `\textstyle`)	\begin{matrix} \sum_{k=1}^N k^2 \end{matrix}	$\begin{matrix} \sum_{k=1}^N k^2 \end{matrix}$
Product	\prod_{i=1}^N x_i	$\prod_{i=1}^N x_i$
Product (force `\textstyle`)	\begin{matrix} \prod_{i=1}^N x_i \end{matrix}	$\begin{matrix} \prod_{i=1}^N x_i \end{matrix}$
Coproduct	\coprod_{i=1}^N x_i	$\coprod_{i=1}^N x_i$
Coproduct (force `\textstyle`)	\begin{matrix} \coprod_{i=1}^N x_i \end{matrix}	$\begin{matrix} \coprod_{i=1}^N x_i \end{matrix}$
Limit	\lim_{n \to \infty}x_n	$\lim_{n \to \infty}x_n$
Limit (force `\textstyle`)	\begin{matrix} \lim_{n \to \infty}x_n \end{matrix}	$\begin{matrix} \lim_{n \to \infty}x_n \end{matrix}$
Integral	\int_{-N}^{N} e^x\, dx	$\int_{-N}^{N} e^x\, dx$
Integral (force `\textstyle`)	\begin{matrix} \int_{-N}^{N} e^x\, dx \end{matrix}	$\begin{matrix} \int_{-N}^{N} e^x\, dx \end{matrix}$
Double integral	\iint_{D}^{W} \, dx\,dy	$\iint_{D}^{W} \, dx\,dy$
Triple integral	\iiint_{E}^{V} \, dx\,dy\,dz	$\iiint_{E}^{V} \, dx\,dy\,dz$
Quadruple integral	\iiiint_{F}^{U} \, dx\,dy\,dz\,dt	$\iiiint_{F}^{U} \, dx\,dy\,dz\,dt$
Path integral	\oint_{C} x^3\, dx + 4y^2\, dy	$\oint_{C} x^3\, dx + 4y^2\, dy$
Intersections	\bigcap_1^{n} p	$\bigcap_1^{n} p$
Unions	\bigcup_1^{k} p	$\bigcup_1^{k} p$

Fractions, matrices, multilines

Feature Syntax How it looks rendered

Fractions \frac{2}{4}=0.5 or {2 \over 4}=0.5 $\frac{2}{4}=0.5$

Small Fractions (force \textstyle) \begin{matrix} \frac{2}{4} \end{matrix} = 0.5 $\begin{matrix} \frac{2}{4} \end{matrix} = 0.5$

Binomial coefficients {n \choose k} ${n \choose k}$

Matrices \begin{matrix} x & y \\ z & v \end{matrix} $\begin{matrix} x & y \\ z & v
\end{matrix}$

\begin{vmatrix} x & y \\ z & v \end{vmatrix} $\begin{vmatrix} x & y \\ z & v
\end{vmatrix}$

\begin{Vmatrix} x & y \\ z & v \end{Vmatrix} $\begin{Vmatrix} x & y \\ z & v
\end{Vmatrix}$

\begin{bmatrix} 0 & \cdots & 0 \\ \vdots & \ddots & \vdots \\ 0 & \cdots & 0\end{bmatrix} $\begin{bmatrix} 0 & \cdots & 0 \\ \vdots
& \ddots & \vdots \\ 0 & \cdots &
0\end{bmatrix}$

\begin{Bmatrix} x & y \\ z & v \end{Bmatrix} $\begin{Bmatrix} x & y \\ z & v
\end{Bmatrix}$

\begin{pmatrix} x & y \\ z & v \end{pmatrix} $\begin{pmatrix} x & y \\ z & v
\end{pmatrix}$

Case distinctions f(n) = \begin{cases} n/2, & \mbox{if }n\mbox{ is even} \\ 3n+1, & \mbox{if }n\mbox{ is odd} \end{cases} $f(n) = \begin{cases} n/2, & \mbox{if }n\mbox{ is even} \\ 3n+1, & \mbox{if }n\mbox{ is odd} \end{cases}$

Multiline equations \begin{matrix}f(n+1) & = & (n+1)^2 \\ \ & = & n^2 + 2n + 1 \end{matrix} $\begin{matrix}f(n+1) & = & (n+1)^2 \\ \ & = & n^2 + 2n + 1 \end{matrix}$

Alternative multiline equations (using tables)



<math>f(n+1)</math>
<math>=(n+1)^2</math>


<math>=n^2 + 2n + 1</math>

$f(n+1) \,\!$	$=(n+1)^2 \,\!$
	$=n^2 + 2n + 1 \,\!$

Breaking up a long expression so that it wraps when necessary


 $f(x) \,\!$ 
 $= \sum_{n=0}^\infty a_n x^n$ 
 $= a_0 + a_1 x + a_2 x^2 + a_3 x^3 + \cdots$

f(x) \,\!

= \sum_{n=0}^\infty a_n x^n

= a_0 + a_1 x + a_2 x^2 + a_3 x^3 + \cdots

Simultaneous equations \begin{cases} 3 x + 5 y + z \\ 7 x - 2 y + 4 z \\ -6 x + 3 y + 2 z \end{cases} $\begin{cases} 3 x + 5 y + z \\ 7 x - 2 y + 4 z \\ -6 x + 3 y + 2 z \end{cases}$

Alphabets and typefaces

Feature	Syntax	How it looks rendered
Greek alphabet (Note the lack of omicron; note also that several upper case Greek letters are rendered identically to the corresponding Roman ones)	\Alpha\ \Beta\ \Gamma\ \Delta\ \Epsilon\ \Zeta\ \Eta\ \Theta\ \Iota\ \Kappa\ \Lambda\ \Mu\ \Nu\ \Xi\ \Pi\ \Rho\ \Sigma\ \Tau\ \Upsilon\ \Phi\ \Chi\ \Psi\ \Omega \alpha\ \beta\ \gamma\ \delta\ \epsilon\ \zeta\ \eta\ \theta\ \iota\ \kappa\ \lambda\ \mu\ \nu\ \xi\ \pi\ \rho\ \sigma\ \tau\ \upsilon\ \phi\ \chi\ \psi\ \omega \varepsilon\ \digamma\ \vartheta\ \varkappa\ \varpi\ \varrho\ \varsigma\ \varphi	$\Alpha\ \Beta\ \Gamma\ \Delta\ \Epsilon\ \Zeta\ \Eta\ \Theta\ \Iota\ \Kappa\ \Lambda\ \Mu\ \Nu\ \Xi\ \Pi\ \Rho\ \Sigma\ \Tau\ \Upsilon\ \Phi\ \Chi\ \Psi\ \Omega$ $\alpha\ \beta\ \gamma\ \delta\ \epsilon\ \zeta\ \eta\ \theta\ \iota\ \kappa\ \lambda\ \mu\ \nu\ \xi\ \pi\ \rho\ \sigma\ \tau\ \upsilon\ \phi\ \chi\ \psi\ \omega$ $\varepsilon\ \digamma\ \vartheta\ \varkappa\ \varpi\ \varrho\ \varsigma\ \varphi$
Blackboard bold	\mathbb{N}\ \mathbb{Z}\ \mathbb{D}\ \mathbb{Q}\ \mathbb{R}\ \mathbb{C}\ \mathbb{H}	$\mathbb{N}\ \mathbb{Z}\ \mathbb{D}\ \mathbb{Q}\ \mathbb{R}\ \mathbb{C}\ \mathbb{H}$
boldface (vectors)	\mathbf{x}\cdot\mathbf{y} = 0	$\mathbf{x}\cdot\mathbf{y} = 0$
boldface (greek)	\boldsymbol{\alpha} + \boldsymbol{\beta} + \boldsymbol{\gamma}	$\boldsymbol{\alpha} + \boldsymbol{\beta} + \boldsymbol{\gamma}$
italics	\mathit{ABCDE abcde 1234}	$\mathit{ABCDE abcde 1234}\,\!$
Roman typeface	\mathrm{ABCDE abcde 1234}	$\mathrm{ABCDE abcde 1234}\,\!$
Fraktur (typeface)	\mathfrak{ABCDE abcde 1234}	$\mathfrak{ABCDE abcde 1234}$
Calligraphy/Script	\mathcal{ABCDE abcde 1234}	$\mathcal{ABCDE abcde 1234}$
Hebrew alphabet	\aleph \beth \gimel \daleth	$\aleph\ \beth\ \gimel\ \daleth$
non-italicised characters	\mbox{abc}	$\mbox{abc}$	$\mbox{abc} \,\!$
mixed italics (bad)	\mbox{if} n \mbox{is even}	$\mbox{if} n \mbox{is even}$	$\mbox{if} n \mbox{is even} \,\!$
mixed italics (good)	\mbox{if }n\mbox{ is even}	$\mbox{if }n\mbox{ is even}$	$\mbox{if }n\mbox{ is even} \,\!$
mixed italics (more legible: ~ is a non-breaking space, while "\ " forces a space)	\mbox{if}~n\ \mbox{is even}	$\mbox{if}~n\ \mbox{is even}$	$\mbox{if}~n\ \mbox{is even} \,\!$

Parenthesizing big expressions, brackets, bars

Feature	Syntax	How it looks rendered
Bad	( \frac{1}{2} )	$( \frac{1}{2} )$
Good	\left ( \frac{1}{2} \right )	$\left ( \frac{1}{2} \right )$

You can use various delimiters with \left and \right:

Spacing

Note that TeX handles most spacing automatically, but you may sometimes want manual control.

Feature	Syntax	How it looks rendered
double quad space	a \qquad b	$a \qquad b$
quad space	a \quad b	$a \quad b$
text space	a\ b	$a\ b$
text space without PNG conversion	a \mbox{ } b	$a \mbox{ } b$
large space	a\;b	$a\;b$
medium space	a\>b	supported
small space	a\,b	$a\,b$
no space	ab	$ab\,$
small negative space	a\!b	$a\!b$

Align with normal text flow

Due to the default css

img.tex { vertical-align: middle; }

an inline expression like $\int_{-N}^{N} e^x\, dx$ should look good.

If you need to align it otherwise, use $...$ and play with the vertical-align argument until you get it right; however, how it looks may depend on the browser and the browser settings.

Also note that if you rely on this workaround, if/when the rendering on the server gets fixed in future releases, as a result of this extra manual offset your formulae will suddenly be aligned incorrectly. So use it sparingly, if at all.

Forced PNG rendering

To force the formula to render as PNG, add \, (small space) at the end of the formula (where it is not rendered). This will force PNG if the user is in "HTML if simple" mode, but not for "HTML if possible" mode (math rendering settings in Preferences).

You can also use \,\! (small space and negative space, which cancel out) anywhere inside the math tags. This does force PNG even in "HTML if possible" mode, unlike \,.

This could be useful to keep the rendering of formulae in a proof consistent, for example, or to fix formulae that render incorrectly in HTML (at one time, a^{2+2} rendered with an extra underscore), or to demonstrate how something is rendered when it would normally show up as HTML (as in the examples above).

For instance:

Syntax	How it looks rendered
a^{c+2}	$a^{c+2}$
a^{c+2} \,	$a^{c+2} \,$
a^{\,\!c+2}	$a^{\,\!c+2}$
a^{b^{c+2}}	$a^{b^{c+2}}$ (WRONG with option "HTML if possible or else PNG"!)
a^{b^{c+2}} \,	$a^{b^{c+2}} \,$ (WRONG with option "HTML if possible or else PNG"!)
a^{b^{c+2}}\approx 5	$a^{b^{c+2}}\approx 5$ (due to " $\approx$ " correctly displayed, no code "\,\!" needed)
a^{b^{\,\!c+2}}	$a^{b^{\,\!c+2}}$
\int_{-N}^{N} e^x\, dx	$\int_{-N}^{N} e^x\, dx$

This has been tested with most of the formulae on this page, and seems to work perfectly.

You might want to include a comment in the HTML so people don't "correct" the formula by removing it:

Color

Equations can use color:

{\color{Blue}x^2}+{\color{Brown}2x}-{\color{OliveGreen}1}
${\color{Blue}x^2}+{\color{Brown}2x}-{\color{OliveGreen}1}$

x_{1,2}=\frac{-b\pm\sqrt{\color{Red}b^2-4ac}}{2a}
$x_{1,2}=\frac{-b\pm\sqrt{\color{Red}b^2-4ac}}{2a}$

Note that color should not be used as the only way to identify something because color blind people may not be able to distinguish between the two colors. See Wikipedia:Manual of Style#Formatting issues.

Examples

Quadratic Polynomial

ax^2 + bx + c = 0

ax^2 + bx + c = 0

Quadratic Polynomial (Force PNG Rendering)

ax^2 + bx + c = 0\,

ax^2 + bx + c = 0\,

Quadratic Formula

x_{1,2}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}

x_{1,2}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}

Tall Parentheses and Fractions

2 = \left( \frac{\left(3-x\right) \times 2}{3-x} \right)

2 = \left( \frac{\left(3-x\right) \times 2}{3-x} \right)

$S_{new} = S_{old} + \frac{ \left( 5-T \right) ^2} {2}$ $S_{new} = S_{old} + \frac{ \left( 5-T \right) ^2} {2}$

Integrals

\int_a^x \int_a^s f(y)\,dy\,ds = \int_a^x f(y)(x-y)\,dy

\int_a^x \int_a^s f(y)\,dy\,ds = \int_a^x f(y)(x-y)\,dy

Summation

\sum_{m=1}^\infty\sum_{n=1}^\infty\frac{m^2\,n}{3^m\left(m\,3^n+n\,3^m\right)}

\sum_{m=1}^\infty\sum_{n=1}^\infty\frac{m^2\,n}

{3^m\left(m\,3^n+n\,3^m\right)}

Differential Equation

u'' + p(x)u' + q(x)u=f(x),\quad x>a

u'' + p(x)u' + q(x)u=f(x),\quad x>a

Complex numbers

|\bar{z}| = |z|, |(\bar{z})^n| = |z|^n, \arg(z^n) = n \arg(z)\,

|\bar{z}| = |z|, |(\bar{z})^n| = |z|^n, \arg(z^n) = n \arg(z)\,

Limits

\lim_{z\rightarrow z_0} f(z)=f(z_0)\,

\lim_{z\rightarrow z_0} f(z)=f(z_0)\,

Integral Equation

\phi_n(\kappa) = \frac{1}{4\pi^2\kappa^2} \int_0^\infty \frac{\sin(\kappa R)}{\kappa R} \frac{\partial}{\partial R}\left D_n(R)}{\partial R}\right \,dR

\phi_n(\kappa) = \frac{1}{4\pi^2\kappa^2} \int_0^\infty

\frac{\sin(\kappa R)}{\kappa R} \frac{\partial}{\partial R}\left[R^2\frac{\partial D_n(R)}{\partial R}\right]\,dR

Example

\phi_n(\kappa) = 0.033C_n^2\kappa^{-11/3},\quad \frac{1}{L_0}\ll\kappa\ll\frac{1}{l_0}\,

\phi_n(\kappa) =

0.033C_n^2\kappa^{-11/3},\quad \frac{1}{L_0}\ll\kappa\ll\frac{1}{l_0}\,

Continuation and cases

f(x) = \begin{cases}1 & -1 \le x < 0 \\
 \frac{1}{2} & x = 0 \\ 1 - x^2 & 0 < x \le 1\end{cases}

f(x) = \begin{cases}1 & -1 \le x < 0 \\

\frac{1}{2} & x = 0 \\ 1 - x^2 & 0 < x\le 1\end{cases}

Prefixed subscript

{}_pF_q(a_1,...,a_p;c_1,...,c_q;z) = \sum_{n=0}^\infty \frac{(a_1)_n\cdot\cdot\cdot(a_p)_n}{(c_1)_n\cdot\cdot\cdot(c_q)_n}\frac{z^n}{n!}\,

{}_pF_q(a_1,...,a_p;c_1,...,c_q;z) = \sum_{n=0}^\infty

\frac{(a_1)_n\cdot\cdot\cdot(a_p)_n}{(c_1)_n\cdot\cdot\cdot(c_q)_n}\frac{z^n}{n!}\,

Bug reports

Discussions, bug reports and feature requests should go to the Mailing list#Wikitech. These can also be filed on under MediaWiki extensions.

External links

A LaTeX tutorial. http://www.maths.tcd.ie/~dwilkins/LaTeXPrimer/
A Portable Document Format document introducing TeX -- see page 39 onwards for a good introduction to the maths side of things: http://www.ctan.org/tex-archive/info/gentle/gentle.pdf
A PDF document introducing LaTeX -- skip to page 59 for the math section. See page 72 for a complete reference list of symbols included in LaTeX and AMS-LaTeX. http://www.ctan.org/tex-archive/info/lshort/english/lshort.pdf
TeX reference card: http://www.csit.fsu.edu/docs/tex/tex-refcard-letter.pdf
http://www.ams.org/tex/amslatex.html
A set of public domain fixed-size math symbol bitmaps: http://us.metamath.org/symbols/symbols.html
MathML - A product of the W3C Math working group, is a low-level specification for describing mathematics as a basis for machine to machine communication. http://www.w3.org/Math/

Feature	Syntax	How it looks rendered
Accents/Diacritics	\acute{a} \quad \grave{a} \quad \hat{a}	$\acute{a} \quad \grave{a} \quad \hat{a}$
Std. functions (good)	\sin a \ \cos b \ \tan c \ \cot d	$\sin a \ \cos b \ \tan c \ \cot d$
Std. functions (wrong)	sin x + ln y + sgn z	$sin x + ln y + sgn z\,\!$
Modular arithmetic	s_k \equiv 0 \pmod{m}	$s_k \equiv 0 \pmod{m}$
Derivatives	\nabla \; \partial x \; dx \; \dot x \; \ddot y	$\nabla \; \partial x \; dx \; \dot x \; \ddot y$
Sets	\forall \; \exists \; \empty \; \emptyset \; \varnothing	$\forall \; \exists \; \empty \; \emptyset \; \varnothing$
Sets	\sqsubset \sqsubseteq \sqsupset \sqsupseteq	$\sqsubset \sqsubseteq \sqsupset \sqsupseteq$
Operators	+ \; \oplus \; \bigoplus \; \pm \; \mp \; -	$+ \; \oplus \; \bigoplus \; \pm \; \mp \; -$
Logic	p \land \wedge \; \bigwedge \; \bar{q} \to p	$p \land \wedge \; \bigwedge \; \bar{q} \to p$
Root	\sqrt{2}\approx 1.4	$\sqrt{2}\approx 1.4$
Root	\sqrt^*{x}	$\sqrt$ ^*{x}
Relations	\sim \; \approx \; \simeq \; \cong \; \dot=	$\sim \; \approx \; \simeq \; \cong \; \dot=$
Geometric	\Diamond \; \Box \; \triangle \; \angle \; \perp	$\Diamond \; \Box \; \triangle \; \angle \; \perp$
Arrows	\leftarrow \; \gets \; \rightarrow \; \to \; \not\to	$\leftarrow \; \gets \; \rightarrow \; \to \; \not\to$
	\rightharpoonup \; \rightharpoondown	$\rightharpoonup \; \rightharpoondown$
	\Leftarrow \; \Rightarrow \; \Leftrightarrow	$\Leftarrow \; \Rightarrow \; \Leftrightarrow$
Special	\eth \; \S \; \P \; \% \; \dagger \; \ddagger	$\eth \; \S \; \P \; \% \; \dagger \; \ddagger$
	\triangleleft \triangleright \infty \bot \top	$\triangleleft \triangleright \infty \bot \top$
	\imath \; \hbar \; \ell \; \mho \; \Finv	$\imath \; \hbar \; \ell \; \mho \; \Finv$
	\diamondsuit \; \heartsuit \; \clubsuit \; \spadesuit	$\diamondsuit \; \heartsuit \; \clubsuit \; \spadesuit$
Lowercase \mathcal has some extras	\mathcal{5} \; \mathcal{abcde \; pqs}	$\mathcal{5} \; \mathcal{abcde \; pqs}$

Feature	Syntax	How it looks rendered
Parentheses	\left ( \frac{a}{b} \right )	$\left ( \frac{a}{b} \right )$
Brackets	\left \frac{a}{b} \right \quad \left \lbrack \frac{a}{b} \right \rbrack	$\quad \left \lbrack \frac{a}{b} \right \rbrack$
Braces	\left \{ \frac{a}{b} \right \} \quad \left \lbrace \frac{a}{b} \right \rbrace	$\left \{ \frac{a}{b} \right \} \quad \left \lbrace \frac{a}{b} \right \rbrace$
Angle brackets	\left \langle \frac{a}{b} \right \rangle	$\left \langle \frac{a}{b} \right \rangle$
Bars and double bars	\left \| \frac{a}{b} \right \vert \left \Vert \frac{c}{d} \right \\|	$\left \| \frac{a}{b} \right \vert \left \Vert \frac{c}{d} \right \\|$
Floor and ceiling functions:	\left \lfloor \frac{a}{b} \right \rfloor \left \lceil \frac{c}{d} \right \rceil	$\left \lfloor \frac{a}{b} \right \rfloor \left \lceil \frac{c}{d} \right \rceil$
Slashes and backslashes	\left / \frac{a}{b} \right \backslash	$\left / \frac{a}{b} \right \backslash$
Up, down and up-down arrows	\left \uparrow \frac{a}{b} \right \downarrow \quad \left \Uparrow \frac{a}{b} \right \Downarrow \quad \left \updownarrow \frac{a}{b} \right \Updownarrow	$\left \uparrow \frac{a}{b} \right \downarrow \quad \left \Uparrow \frac{a}{b} \right \Downarrow \quad \left \updownarrow \frac{a}{b} \right \Updownarrow$
Delimiters can be mixed, as long as \left and \right match	\left [ 0,1 \right ) \left \langle \psi \right \|	$\left [ 0,1 \right )$ $\left \langle \psi \right \|$
Use \left. and \right. if you don't want a delimiter to appear:	\left . \frac{A}{B} \right \} \to X	$\left . \frac{A}{B} \right \} \to X$
Size of the delimiters	\big( \Big( \bigg( \Bigg( ... \Bigg] \bigg] \Big] \big]	$\big( \Big( \bigg( \Bigg( ... \Bigg] \bigg] \Big] \big]$
	\big\{ \Big\{ \bigg\{ \Bigg\{ ... \Bigg\rangle \bigg\rangle \Big\rangle \big\rangle	$\big\{ \Big\{ \bigg\{ \Bigg\{ ... \Bigg\rangle \bigg\rangle \Big\rangle \big\rangle$
	\big\\| \Big\\| \bigg\\| \Bigg\\| ... \Bigg\| \bigg\| \Big\| \big\|	$\big\\| \Big\\| \bigg\\| \Bigg\\| ... \Bigg\| \bigg\| \Big\| \big\|$
	\big\lfloor \Big\lfloor \bigg\lfloor \Bigg\lfloor ... \Bigg\rceil \bigg\rceil \Big\rceil \big\rceil	$\big\lfloor \Big\lfloor \bigg\lfloor \Bigg\lfloor ... \Bigg\rceil \bigg\rceil \Big\rceil \big\rceil$
	\big\uparrow \Big\uparrow \bigg\uparrow \Bigg\uparrow ... \Bigg\Downarrow \bigg\Downarrow \Big\Downarrow \big\Downarrow	$\big\uparrow \Big\uparrow \bigg\uparrow \Bigg\uparrow ... \Bigg\Downarrow \bigg\Downarrow \Big\Downarrow \big\Downarrow$
	\big\updownarrow \Big\updownarrow \bigg\updownarrow \Bigg\updownarrow ... \Bigg\Updownarrow \bigg\Updownarrow \Big\Updownarrow \big\Updownarrow	$\big\updownarrow \Big\updownarrow \bigg\updownarrow \Bigg\updownarrow ... \Bigg\Updownarrow \bigg\Updownarrow \Big\Updownarrow \big\Updownarrow$
	\big / \Big / \bigg / \Bigg / ... \Bigg\backslash \bigg\backslash \Big\backslash \big\backslash	$\big / \Big / \bigg / \Bigg / ... \Bigg\backslash \bigg\backslash \Big\backslash \big\backslash$

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