2

I want to write an equation with bold extended brackets.

For instance in: 

\left[ \frac{1}{2} \vec{\nabla} \times \vec{v} \right]

I want \left[ and \right] to be bold. I already tried https://tex.stackexchange.com/a/99286/15659 nothing is doing the trick.

Community
  • 1
Kyle_the_hacker
  • 884

2 Answers2

5

You can do

enter image description here

\documentclass{article}
\usepackage{bm}
\showoutput
\begin{document}

$[ \vec{\nabla} \times \vec{v} ]$

$\bm{[} \vec{\nabla} \times \vec{v} \bm{]}$

\end{document}

It does not work with \left, \right with the default cm fonts as there is no bold extension font (for large brackets) in that font set. However extended brackets are not needed here.

David Carlisle
  • 757,742
1

Here is the best solution I could found:

\pmb{\left[\vphantom{\frac{1}{2}}\right.}
\frac{1}{2} \vec{\nabla} \times \vec{v}
\pmb{\left.\vphantom{\frac{1}{2}}\right]}

It is dirty, but it does exactly what I want:

enter image description here

Kyle_the_hacker
  • 884
  • 2
    You can define a macro to handle the phantom automatically by defining it as: \pmb{\left[\vphantom{#1}\right.} #1 \pmb{\left.\vphantom{#1}\right]} – Mobius Pizza Apr 15 '15 at 12:47