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I need to use a notation for the restriction of a measure to a set. It is similar to \mu \llcorner A, but I want the symbol defined by \llcorner to be bigger. I can't seem to find the right command for this.

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The result I want is something like the symbol in the pictures. The second picture is from Evans and Gariepy. The third one is from Federer's Geometric Measure Theory, so I don't think they are just isolated notations.

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    Could you post a picture of where you have seen that notation? In this document, for instance, the notation for the restriction of a measure \mu to a set A seems to be \left.\mu\right\rvert_A.
    – jub0bs
    Apr 6 '13 at 23:29
  • 2
    @Jubobs You probably mean \mu\big|_{A}
    – egreg
    Apr 6 '13 at 23:34
  • @egreg You must be right. The vertical bar is not a delimiter here...
    – jub0bs
    Apr 6 '13 at 23:35
  • 2
    @Jubobs Not only that: \left. adds an unwanted space (and \right too).
    – egreg
    Apr 6 '13 at 23:36
  • I have seen the Jubobs notation and the same but with a vertical harpoon instead of the vertical bar. But never seen that notation.
    – Manuel
    Apr 7 '13 at 10:54
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You can build the Evans and Gariepy notation with

\documentclass{article}

\usepackage{graphicx}

\newcommand{\measurerestr}{%
  \,\raisebox{-.127ex}{\reflectbox{\rotatebox[origin=br]{-90}{$\lnot$}}}\,%
}

\begin{document}
$\mu\measurerestr A,$
\end{document}

enter image description here

2
  • That's great. Thank you. So there isn't any predefined symbol for this... Apr 7 '13 at 12:36
  • @BeniBogosel Never seen before. And texdoc symbols didn't reveal anything useful.
    – egreg
    Apr 7 '13 at 13:02
6

This shape is simple enough to build with rules:

Sample output

\documentclass{article}

\newcommand{\mres}{\mathbin{\vrule height 1.6ex depth 0pt width
0.13ex\vrule height 0.13ex depth 0pt width 1.3ex}}

\begin{document}

\( \mu \mres B(A) \)

\end{document}

There is also \niv in the nath fonts.

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