| Invoke the array environment (see Note below) | End the array environment (see Note below) | ||
| The \left and \right commands must be used in pairs to provide flexible delimiters that fit the formula inside. Put the desired delimiter — ( and ), for example — immediately after the \left and \right commands. For example, \left( \frac{x}{y} \right) provides x/y as a fraction within parentheses that fit the expression’s size. | 
| The \begin and \end commands must be used in pairs to mark the beginning and end of an environment. The only supported environment is the array. For example, \begin{array}{clcr} 1 & 2 & 3 \\ 4 & 5 & 6\end{array} creates a matrix with 2 rows and three columns. | 
| • | Use the syntax \frac{numerator}{denominator} to create a fraction. For example, the expression \frac{n!}{k!(n-k)!} produces the following output: | 
| • | Use the syntax \sqrt[order]{expression} to create a root surrounding an expression. The [order] argument is optional; without it, the syntax produces a square root. For example, \sqrt[n]{1+x^2} produces the following output: | 
| The \textsuperscript and ^ syntax alternatives are identical for creating superscripts. Likewise, \textsubscript and _ are identical for creating subscripts. | 
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