7

I tried inserting an upside-down triangle with \triangledown but even when I put the two $ signs around it, I keep receiving an error. Does anyone know how to insert such special characters?

  • 2
    If I remember correctly, \triangledown requires the amssymb package, so let’s begin by eliminating the obvious: are you loading that package? Ah, and Welcome to TeX.SX! I didn’t notice it before. – GuM Mar 28 '16 at 0:29
9

If the error message is:

! Undefined control sequence.
<recently read> \triangledown

l.3 $\triangledown
                  $
?

then a package is missing, which provides the symbol. For example, package amssymb provides the symbol:

\documentclass{article}
\usepackage{amssymb}
\begin{document}
$\triangledown$
\end{document}

\triangledown of amssymb

If you want to have the nabla symbol, then this symbol is available without additional packages:

\documentclass{article}
\begin{document}
$\nabla$
\end{document}

Result

  • I was actually looking for the nabla symbol but didn't know they are different. Thank you so much! – Penemonie Mar 28 '16 at 1:21

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