如何将楔形物和 V 形物放入盒子内？

Question

我想将 \wedge 和 \vee 放在像图中这样的框中。

我已尝试过 \framebox，但是没有作用。

Answer 1

您可以将符号\vee和框起来\wedge。

\documentclass{article}
\usepackage{amsmath}

\makeatletter
\newcommand{\boxedsymbol}[2]{%
  \begingroup
  \setlength{\fboxsep}{0pt}%
  \fbox{%
    $\m@th#1\mspace{-1.25mu}#2\mspace{-1.25mu}$%
  }%
  \endgroup
}
\makeatother
\newcommand{\boxvee}{\mathbin{\mathpalette\boxedsymbol\vee}}
\newcommand{\boxwedge}{\mathbin{\mathpalette\boxedsymbol\wedge}}

\begin{document}

$\varepsilon_{A}(\mathbf{x})=A^{t}\boxwedge\mathbf{x}$

$\delta_{A}(\mathbf{x})=A^{t}\boxvee\mathbf{x}$

$
{\boxvee}\ {\boxwedge}\ 
\scriptstyle
{\boxvee}\ {\boxwedge}\ 
\scriptscriptstyle
{\boxvee}\ {\boxwedge}
$

\end{document}

根据数学字体，您可能需要调整 1.25mu 的长度。

精致版本，具有不同的规则厚度和一些其他调整。

\documentclass{article}
\usepackage{amsmath}

\makeatletter
\newcommand{\boxedsymbol}[2]{%
  \begingroup
  \setlength{\fboxsep}{0pt}%
  \setlength{\fboxrule}{\variable@rule{#1}}%
  \fbox{%
    $\m@th#1\variable@space{#1}#2\variable@space{#1}$%
  }%
  \endgroup
}
\newcommand{\variable@rule}[1]{%
  \fontdimen8  
  \ifx#1\displaystyle\textfont3\else
    \ifx#1\textstyle\textfont3\else
      \ifx#1\scriptstyle\scriptfont3\else
        \scriptscriptfont3\relax
  \fi\fi\fi
}
\newcommand{\variable@space}[1]{%
  \mspace{-
    \ifx#1\displaystyle 1.25\else
      \ifx#1\textstyle 1.25\else
        \ifx#1\scriptstyle 1.4\else
          1.6%
    \fi\fi\fi
  mu}%
}
\makeatother
\newcommand{\boxvee}{\mathbin{\mathpalette\boxedsymbol\vee}}
\newcommand{\boxwedge}{\mathbin{\mathpalette\boxedsymbol\wedge}}

\begin{document}

$\varepsilon_{A}(\mathbf{x})=A^{t}\boxwedge\mathbf{x}$

$\delta_{A}(\mathbf{x})=A^{t}\boxvee\mathbf{x}$

$
{\boxvee}\ {\boxwedge}\ 
\scriptstyle
{\boxvee}\ {\boxwedge}\ 
\scriptscriptstyle
{\boxvee}\ {\boxwedge}
$

{\large$\boxvee\ \scriptstyle\boxvee$}

{\footnotesize$\boxvee\ \scriptstyle\boxvee$}

\end{document}

Answer 2

带有 TikZ 和黄色背景的“脏”版本 ;-)

\documentclass{article}

\usepackage{mathtools}
\usepackage{tikz}

\newcommand{\tightbox}[1]{%
  \tikz{\node[rectangle,fill=yellow,draw,inner sep=0.25pt,line width=0.25pt] (A) {$#1$};}%
}

\begin{document}
$\vee$ \tightbox{\vee}  \tightbox{\wedge}
\end{document}