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I was using

\newcommand*{\pb}{\mbox{\LARGE{$\mathrlap{\cdot}\lrcorner$}}}

and put

\arrow[dr, phantom, "\pb", very near start]

in tikz-cd code to indicate a pullback square. It works well in my previous LaTeX but does not now, it looks like:

enter image description here

The dot goes too much to the left when it should be in the middle of the lrcorner. How to fix this?

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    Please post a complete MWE. Are you loading the mathtools package? For what it's worth, we could also draw that symbol with just TikZ. Also, \large is a switch, not a argument-ed macro. (No difference in this case but syntactically weird.)
    – Qrrbrbirlbel
    Feb 20 at 11:15
  • OK, thank you! I added mathtools and it's now good😂
    – Lao-tzu
    Feb 20 at 11:17
  • 2
    I’m voting to close this question because it has been solved by the comments.
    – Sebastiano
    Feb 20 at 13:25

1 Answer 1

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You should have gotten an error about an undefined control sequence:

<recently read> \mathrlap 
                          
l.8 \end{tikzcd}
                
The control sequence at the end of the top line
of your error message was never \def'ed.

The package mathtools that provides \mathrlap is missing.

Since \LARGE is also not a macro that takes on argument but just switches the font size I've adjusted the definition of \pb accordingly.

Code

\documentclass{article}
\usepackage{amssymb}   % for \lrcorner
\usepackage{mathtools} % for \mathrlap
\usepackage{tikz-cd}
\newcommand*{\pb}{\mbox{\LARGE$\mathrlap{\cdot}\lrcorner$}}
\begin{document}
\begin{tikzcd}
  A \arrow[dr, phantom, "\pb", very near start] \\
& B
\end{tikzcd}
\end{document}

Output

enter image description here

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