 To see how any formula was written in any question or answer, including this one, rightclick on the expression it and choose "Show Math As > TeX Commands". (When you do this, the '$' will not display. Make sure you add these. See the next point.)
 For inline formulae , enclose the formula in either
$...$ or \( ... \) . For displayed formulae use $$ ...$$ or \[...\] . They render differently. For instance $\gamma$ and $$\gamma \tag{displayed}$$
 For Greek letters, use
\alpha, \beta, ..., \omega . They render as $\alpha, \beta, … \omega$. For uppercase use \Gamma, \Delta, ..., \Omega . Those render as $\Gamma, \Delta, …, \Omega$.
 Groups: Superscripts, subscripts, and other operations apply only to the next “group”. A “group” is either a single symbol, or any formula surrounded by curly braces
{...} . For example x_{ij} renders as $x_{ij}$. The same thing applies for powers.
 Parenteses: Ordinary symbols
(...) and [...] make parentheses and brackets. For curly brackets use \{...\} . For instance \{a_n\}_{n=1}^{\infty} renders as $\{a_n\}_{n=1}^{\infty}$. If you want to scale them use \left\{ ... \right\} . Note however that this command do not scale the formula in between.
 Sums and Integrals: The basic command for sums is
\sum . followed by a subscript and a superscript, while the basic command of an integral is \int . To write a product use \prod .You can also write double and triple integrals by invoking the commands \iint or \iiint . They would render as $\sum, \; \int, \; \prod, \; \iint , \; \iiint$ and $$\sum, \; \int, \; \prod, \; \iint , \; \iiint$$ respectively. You also have the ability to write contour integral by just typing \oint . It renders as $$\oint$$
 Fractions: The command that allows you to write a fraction is
\frac{...}{...} where the dots are replaced by the nominator and denominator respectively.
 Fonts: You have the ability to use the following fonts:

\mathbb{...} for "blackboard bold" letters.

\mathbf{...} for boldface letters. You can apply the command to small letters, e.g $\mathbf{a}$.

\mathtt{...} for "typewriter" type font letters.

\mathrm{...} for "Roman" type font letter. You can also apply the command to small letters, e.g $\mathrm{a}$.

\mathsf{...} for Sans Serif letters. You can also apply the command to small letters , e.g $\mathsf{a}$.

\mathcal{...} for caligrafic letters.

\mathscr{...} for script letters.

\mathfrak{...} for fraktur letters (German Old Style). You can also apply the command to small letters, e.g $\mathfrak{c}$.
 Functions in $\tLaTeX$ as written in a special way. We provide the codes for some of them:
\sin \cos \tan \cot \lim \max \min \ln \log . They render as $\sin$ , $\cos$, $\tan$, $\cot$, $\lim$, $\max$, $\min$, $\ln$, $\log$ respectively. Don't forget to insert the backslash \ in front of them, because otherwise ungly italicised result. MathJaX also supports other functions like the inverse trigonometric functions. To display them in a post simply use the commands \sinh , \cosh , \tanh , \arcsin, \arcsinh .
 Note 1: The arguement of the functions is placed after leaving a space. For example $$\ln \left(x+\sqrt{x^2+1}\right)$$ is rendered by the code
\ln \left(x+\sqrt{x^2+1}\right) .
 Note 2: If you would like to write the max, limit and sum operators in inline mode prefer to use them along with the
\limits . command. There are many other commands to force the display mode in inline mode but this is the easier.
 Note 3: Avoiding enforcing display mode in inline mode unless truly necessary. In case you want to do so invoke the
\displaystyle command.
 Radical signs: You can also write radical equations, by just typing
\sqrt[...]{...} where the first dot corresponds for the order of the radical while the second for its arguement. For instance \sqrt[3]{x} renders as $\sqrt[3]{x}$.
