I am trying to format a vector gradient with two fractions in it but unfortunately I get it displayed with double braces around the two fractions. Here's my LaTeX:

\nabla f = \left(
 \frac{\partial f}{\partial x_1}  \\
 \frac{\partial l}{\partial x_2}  \\
\end{pmatrix} \right)

vector gradient

I would like to have only one brace around the two fractions. How would I have to format it then?

  • 6
    pmatrix already makes the parentheses. You don't need \left and \right there.
    – campa
    Dec 18, 2019 at 11:18
  • 2
    Note that there is something wrong with your font setup: the subscript numbers are too large.
    – campa
    Dec 18, 2019 at 11:25

1 Answer 1


From the amsmath documentation:

The amsmath package provides some environments for matrices beyond the basic array environment of LaTeX. The pmatrix, bmatrix, Bmatrix, vmatrix and Vmatrix have (respectively) (), [], {}, ||, and || || delimiters built in. For naming consistency there is a matrix environment sans delimiters.

Thewrefore, when using the pmatrix environment you need no \left( and \right).

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .