答案1
如果您对曲线不介意,您可以\sphericalangle
用进行叠加\cdot
。否则...使用图片模式!
\documentclass{article}
\usepackage{amssymb}
\newcommand*{\considerA}{{\sphericalangle\mkern-8.5mu{\cdot}\mkern5.5mu}}
\usepackage{pict2e}
\makeatletter
\newcommand*{\considerB}{{\mkern2mu\mathpalette\consider@B\relax\mkern2mu}}
\newcommand*{\consider@B}[2]{%
\setbox\z@=\hbox{$#1\mkern18mu$}%
\unitlength\wd\z@
\vcenter{%
\hbox{%
\begin{picture}(.6,.5)
\roundcap\roundjoin
\linethickness{\fontdimen8
\ifx#1\displaystyle\textfont\else
\ifx#1\textstyle\textfont\else
\ifx#1\scriptstyle\scriptfont\else
\scriptscriptfont\fi\fi\fi\thr@@}% default frac rule width
\Line(.6,0)(0,.25)(.6,.5)
\Line(.5,.042)(.5,.458)
\put(.35,.25){\circle*{.1}}
\end{picture}%
}%
}%
}
\makeatother
\begin{document}
$X \considerA X$
$\scriptstyle X \considerA X$
$\scriptscriptstyle X \considerA X$
$X \considerB X$
$\scriptstyle X \considerB X$
$\scriptscriptstyle X \considerB X$
\end{document}