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方程式中的引用未定义

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方程式中的引用未定义

\label{}所以我的问题是，我的序言和and命令之间似乎存在冲突\ref{}。当我在定义环境中引用时，一切都很顺利，但每当我尝试在方程环境中标记某些内容时，引用就会变得未定义，无论方程位于定义/定理环境中还是仅位于文档中。

以下是我的序言以及一个例子：

\documentclass[a4paper,11pt]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage{paralist}
\usepackage{fancyhdr}
\usepackage{amsmath, amssymb, amsfonts}
\usepackage{mathtools}
\usepackage[usenames,dvipsnames,svgnames,table]{xcolor}
\usepackage[framed, thmmarks, standard]{ntheorem}
\usepackage{framed}
\usepackage{pstricks}

\pagestyle{fancy}
\fancyhf{}
\rfoot{page \thepage}
\renewcommand{\headrulewidth}{0pt}

\numberwithin{equation}{section}

\definecolor{lightgray}{gray}{0.94}

\theoremseparator{:}
\theoremstyle{nonumberplain}
\theoremheaderfont{\itshape}
\theorembodyfont{\normalfont}
\theoremsymbol{\nolinebreak[1]\hspace*{.5em plus 1fill}\ensuremath{\Box}}
\newtheorem{myproof}{Proof}

\theoremstyle{break}
\theoremheaderfont{\normalfont\bfseries}\theorembodyfont{\slshape}
\theoremseparator{}
\theoremsymbol{}
\shadecolor{lightgray}
\newshadedtheorem{thm}{Theorem}[section]

\theoremstyle{break}
\theoremheaderfont{\normalfont\bfseries}\theorembodyfont{\slshape}
\theoremseparator{}
\theoremsymbol{}
\shadecolor{lightgray}
\newshadedtheorem{mydef}{Definition}[section]

\begin{document}

\section{First section}

\begin{mydef}[Something]
\label{def:something}
We will now define something. It has a property:
\begin{equation}
\label{eq:first}
x+y=z
\end{equation}
\end{mydef}

Now I want to reference it. according to definition 
\ref{def:something} we have.. 
If we look at equation \ref{eq:first}...

Also we have another equation:
\begin{equation}
\label{eq:second}
z>0
\end{equation}

I also want to talk about equation \ref{eq:second}

\end{document}

有人能看出问题出在哪里吗？提前致谢。

答案1

根据文档第 3.2.1 节，如果加载该包，则应ntheorem添加选项：amsmaththmmarksamsmath

\usepackage[amsmath,thmmarks]{ntheorem}

完整示例：

\documentclass[a4paper,11pt]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage{paralist}
\usepackage{fancyhdr}
\usepackage{amsmath, amssymb, amsfonts}
\usepackage{mathtools}
\usepackage[usenames,dvipsnames,svgnames,table]{xcolor}
\usepackage[amsmath,framed, thmmarks, standard]{ntheorem}
\usepackage{framed}
\usepackage{pstricks}

\pagestyle{fancy}
\fancyhf{}
\rfoot{page \thepage}
\renewcommand{\headrulewidth}{0pt}

\numberwithin{equation}{section}

\definecolor{lightgray}{gray}{0.94}

\theoremseparator{:}
\theoremstyle{nonumberplain}
\theoremheaderfont{\itshape}
\theorembodyfont{\normalfont}
\theoremsymbol{\nolinebreak[1]\hspace*{.5em plus 1fill}\ensuremath{\Box}}
\newtheorem{myproof}{Proof}

\theoremstyle{break}
\theoremheaderfont{\normalfont\bfseries}\theorembodyfont{\slshape}
\theoremseparator{}
\theoremsymbol{}
\shadecolor{lightgray}
\newshadedtheorem{thm}{Theorem}[section]

\theoremstyle{break}
\theoremheaderfont{\normalfont\bfseries}\theorembodyfont{\slshape}
\theoremseparator{}
\theoremsymbol{}
\shadecolor{lightgray}
\newshadedtheorem{mydef}{Definition}[section]

\begin{document}

\section{First section}

\begin{mydef}[Something]
\label{def:something}
We will now define something. It has a property:
\begin{equation}
\label{eq:first}
x+y=z
\end{equation}
\end{mydef}

Now I want to reference it. according to definition 
\ref{def:something} we have.. 
If we look at equation \ref{eq:first}...

Also we have another equation:
\begin{equation}
\label{eq:second}
z>0
\end{equation}

I also want to talk about equation \ref{eq:second}

\end{document}

在此处输入图片描述

答案2

使用更简化的示例，您可以看到thmmarks导致问题的是选项

\documentclass[a4paper,11pt]{article}
\usepackage[T1]{fontenc}


\usepackage{amsmath}

\usepackage
%[thmmarks]
{ntheorem}

\numberwithin{equation}{section}

\newtheorem{mydef}{Definition}[section]

\begin{document}

\section{First section}

\begin{mydef}[Something]
\label{def:something}
We will now define something. It has a property:
\begin{equation}
\label{eq:first}
x+y=z
\end{equation}
\end{mydef}

Now I want to reference it. according to definition 
\ref{def:something} we have.. 
If we look at equation \ref{eq:first}...

Also we have another equation:
\begin{equation}
\label{eq:second}
z>0
\end{equation}

I also want to talk about equation \ref{eq:second}

\end{document}

尚未准确追踪标签的位置，如果使用该选项，它根本不会写入辅助文件。

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