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, 2016 at 0:29

1 Answer 1


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:


\triangledown of amssymb

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



  • I was actually looking for the nabla symbol but didn't know they are different. Thank you so much! Mar 28, 2016 at 1:21

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