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Use the “/” character for division. The equation editor will reformat the expression to place the numerator above the denominator. To prevent vertical buildup of the fraction, use “\/” instead of “/” alone. As with superscripts and subscripts, you can use parentheses to group expressions into a numerator and denominator. Examples follow:
| Type | To Display | Comments |
| a/b | 
| |
| (a+b)/(c+d) | 
| Parentheses do not print. |
| ((a+b))/(c+d) | 
| The double parentheses are needed so that the single parentheses print in the numerator. |
| ((a+b)/(c+d) + n)/(f(x)+e^(1\/2))<sp> | 
| The “/” is preceded by “\” in the exponential to provide a horizontal fraction ( instead of  ).
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If you need to stack expressions without the horizontal division line, use \atop or \matrix. The vertical bar “|” can also be used in place of \atop.
| Type | To Display | Comments |
| a\atop b or a|b | 
| Do not add spaces between the expression and the vertical bar. |
| (a+b)\atop(c+d) | 
| Parentheses do not print. |
| f(x)={\matrix \infty x=0@0 x\ne 0 \close | 
| The @ character ends a row of the matrix. |
| A=[\matrix x_11&x_12&x_13@ x_21&x_22&x23@ X_31&x_32&x_33] | 
| The & character separates columns of the matrix. |
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