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I am trying to write this command below but it doesnt work.

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This question got bumped due to an edit to one of the answers. Before voting it down, please read tex.blogoverflow.com/2012/08/maintaining-a-balance –  Andrew Stacey Oct 4 '12 at 10:17
To address the OP’s apparent misconception: You may have been told to write $\triangle$ to get the △ shape, but that’s because you need to be in “math mode” to use the \triangle command. A single $ puts you into math mode, where you can use both the \triangle command and the superscript operator. –  J. C. Salomon Oct 4 '12 at 12:27
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up vote 13 down vote accepted

You have additional $ signs in your code snippet. The superscript ^, and subscript _ need to be in math mode.

Use $\triangle^m$ for superscript. If you want a subscript use $\triangle_m$. If you intention is to make the entire term a sub- or superscript then you'll need to enclose it with a {} group.

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  • For the superscript version, I think it looks better if you slightly move the superscript to the left via a \kern.
  • If your intent is to use display math you should use \[ and \] instead of $$ delimiters. See Why is \[ ... \] preferable to $$?.



Inline math: $\triangle^m \quad \triangle_m$
\[ \text{Display math:}\quad \triangle^m \quad \triangle_m \]
If the entire term is to be super or sub script:
\[ \text{Display math:}\quad x_{\triangle^m} \quad x_{\triangle_m} \]
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  • If you want to produce an dollar sign followed by a triangle followed by a dollar sign followed by a superscript m, the correct syntax is $\$\triangle\$^m$.
  • If you want to produce a subscript triangle and a superscript m, the correct syntax is ${}_\triangle^m$.
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