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I need the LaTeX equation with double square bracket and double paranthesis. Can anyone suggest me the proper code? Here, I had attached the screenshots. enter image description here

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2 Answers 2

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In favour of Consistent typography, I always suggest creating a command that generates a certain output:

enter image description here

\documentclass{article}
\newcommand{\llrrbracket}[1]{% \llrrbracket{..}
  \left[\mkern-3mu\left[#1\right]\mkern-3mu\right]}
\newcommand{\llrrparen}[1]{% \llrrparen{..}
  \left(\mkern-6mu\left(#1\right)\mkern-6mu\right)}
\begin{document}
\[
  \llrrbracket{\frac{1}{x}} \quad \mbox{in the case }
  P_\infty = F_p\llrrparen{\frac{1}{x}}
\]
\end{document}

You can, of course, play around with the choice of \mkern, which brings the two elements together.

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  • This is a nice way to do it! Commented Aug 1, 2013 at 0:23
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You can try the following:

    \documentclass{article}
    \usepackage{amsmath}
    \usepackage{amsfonts}
    \usepackage{stmaryrd}
    \begin{document}
    \begin{equation}
    \bigg\llbracket \frac{1}{x}\bigg\rrbracket  \text{ in the case } P_\infty = \mathbb{F}_p \left(\left(\frac{1}{x} \right)\right)
\end{equation}
    \end{document}

enter image description here

EDIT:

I have updated the code to contain the suggestion given in the comment. The above code uses the stmaryrd package.

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