Basics: Math Mode
So you can type a simple document. Let's get down to the business we came for: typing math.You tell LaTeX that you are going to type math commands by putting them between a pair of dollar signs:
$ math stuff here $
If you want the math code to be centered on its own line, use two dollar signs at each end:
$$ centered math stuff here $$
Now for the codes:
| Code | Use | Sample code | Appearance |
| ^ | exponents | $x^5 * x^{5y}$ |
 |
| _ | subscripts | $x_5 * x_{5y}$ |
 |
| \frac{}{} | fractions | $\frac{a+b}{a^2-b^2}$ |
 |
| \sqrt{} | square roots | $\sqrt{15}$ |
 |
| \sqrt[n]{} | n-th roots | $\sqrt[5]{3}$ |
 |
| \sum | summations | $\sum_{i=1}^n r^i$ |
 |
| \int | integrals | $\int_1^t \frac{dt}{t}$ |
 |
| \ldots | elipsis | $x_1+\ldots+x_n$ |
 |
| Lower-case Greek letters | $\delta + \gamma$ |
 |
|
| Upper-case Greek letters | $\Delta + \Gamma$ |
 |
|
| \lim | limits | $\lim_{x\rightarrow10} \frac{|x-10|}{x-10}$ |
 |
Other "math words" like sin, cos, tan, arccos, liminf, limsup, log, ln, max, min, and many more can be used the same way \lim is used.
WinEdt Math Toolbar: Click on the 
button and this will open up another toolbar in WinEdt:
Use the code \displaystyle at the beginning of a math expression to make it look better. For example, if we add it to the summation example above:
$\displaystyle \sum_{i=1}^n r^i$
Then we get the better looking output:
Displaystyle also helps improve the appearance of fractions and integrals.
Parentheses, Brackets, and Braces
You can use (parentheses) and [brackets] as you like. To type {curly braces}, you must precede them with a backslash:
\{inside!\}
Looks like {inside!}.
To get these grouping symbols to automatically grow to fit what's inside, you can precede them with \left and \right.
$\left( \frac{x}{10} \right)$
This code will show the fraction x/10 with parentheses stretched to fit the whole fraction. These symbols must appear in pairs; if you want to omit the left or right grouping symbol, use a period instead:
$\left( \frac{x}{10} \right.$
This code will show the fraction x/10 with only a left parenthesis.
Other fun commands you should look up:
- \begin{align}...\end{align}: for typing a sequence of aligned equations
- \begin{array}...\end{array}: for typing bananas. (Not really.)