在彩色框中显示方程编号（无括号）

Question

在附加的代码中，我想让方程编号像这样以方框形式显示：

而不是通常的括号“()”。

这是我的 MWE：

\documentclass[11pt,fleqn]{book}
\usepackage[english]{babel}
\usepackage{xcolor}
\usepackage{amsmath,amsfonts,amssymb,amsthm}

\usepackage[most]{tcolorbox}
\definecolor{ocre}{RGB}{243,102,25}
\definecolor{mygray}{RGB}{243,243,244}
\tcbset{myformula/.style={
  arc=0pt,
  outer arc=0pt,
    colback=mygray,
  colframe=ocre,
  boxrule=0.8pt,
  left=2pt,
  right=2pt,
  highlight math style={
    arc=0pt,
    outer arc=0pt,
    colback=mygray,
    colframe=red.
    }
  }
}

\newenvironment{spread}[1]{%
  \advance\jot#1% indeed
  }{%
\ignorespacesafterend
}

\begin{document}
\chapter{This is how it all began}
\section{Introduction}

\begin{tcolorbox}[ams align,myformula]
LT~&\approx~\frac{400}{F_{c}}(1-log_{10}|\Delta F|)\\
\Delta F~&=~\frac{Frequency~Tolerance}{Frequency~Jump}\nonumber
\end{tcolorbox}

\end{document}

Answer 1

您可以重新定义内部\tagform@；原始定义是

\def\tagform@#1{\maketag@@@{(\ignorespaces#1\unskip\@@italiccorr)}}

我用的是\fcolorbox：

\makeatletter
\def\tagform@#1{\fcolorbox{ocre}{mygray}{\maketag@@@{\ignorespaces\textcolor{ocre}{#1}\unskip\@@italiccorr}}}
\makeatother

完整代码：

\documentclass[11pt,fleqn]{book}
\usepackage[english]{babel}
\usepackage{xcolor}
\usepackage{amsmath,amsfonts,amssymb,amsthm}

\usepackage[most]{tcolorbox}
\definecolor{ocre}{RGB}{243,102,25}
\definecolor{mygray}{RGB}{243,243,244}

\tcbset{myformula/.style={
  arc=0pt,
  outer arc=0pt,
    colback=mygray,
  colframe=ocre,
  boxrule=0.8pt,
  left=2pt,
  right=2pt,
  highlight math style={
    arc=0pt,
    outer arc=0pt,
    colback=mygray,
    colframe=red.
    }
  },
}

\newenvironment{spread}[1]{%
  \advance\jot#1% indeed
  }{%
\ignorespacesafterend
}

\makeatletter
\def\tagform@#1{\fcolorbox{ocre}{mygray}{\maketag@@@{\ignorespaces\textcolor{ocre}{#1}\unskip\@@italiccorr}}}
\makeatother

\begin{document}
\chapter{This is how it all began}
\section{Introduction}

A cross-reference using \verb!\ref!: \ref{equ:test}\par\noindent
A cross-reference using \verb!\eqref!: \eqref{equ:test}
\begin{tcolorbox}[ams align,myformula]
LT~&\approx~\frac{400}{F_{c}}(1-log_{10}|\Delta F|) \label{equ:test}\\
\Delta F~&=~\frac{Frequency~Tolerance}{Frequency~Jump}\nonumber
\end{tcolorbox}

\end{document}

Answer 2

这是一个简单的解决方案mathtools及其\newtagform命令：

\documentclass[11pt,fleqn]{book}
\usepackage[english]{babel}
\usepackage{xcolor}
\usepackage{mathtools,amsfonts,amssymb,amsthm}
\newtagform{boxed}[\fboxrule=0.6pt\fcolorbox{ocre}{ocre!15!}]{\color{ocre}}{}
\usepackage[most]{tcolorbox}
\definecolor{ocre}{RGB}{243,102,25}
\definecolor{mygray}{RGB}{243,243,244}
\tcbset{myformula/.style={
  arc=0pt,
  outer arc=0pt,
    colback=mygray,
  colframe=ocre,
  boxrule=0.8pt,
  left=2pt,
  right=2pt,
  highlight math style={
    arc=0pt,
    outer arc=0pt,
    colback=mygray,
    colframe=red.
    }
  }
}

\newenvironment{spread}[1]{%
  \advance\jot#1% indeed
  }{%
\ignorespacesafterend
}

\begin{document}
\chapter{This is how it all began}
\section{Introduction}
\usetagform{boxed}
\begin{tcolorbox}[ams align,myformula]
LT~&\approx~\frac{400}{F_{c}}(1-log_{10}|\Delta F|)\label{coloureq}\\
\Delta F~&=~\frac{Frequency~Tolerance}{Frequency~Jump}\nonumber
\end{tcolorbox}

\ref{coloureq}

\eqref{coloureq}

\end{document}