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没有出现数学符号

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没有出现数学符号

在我的 tex 文件中，= 没有出现。

\RequirePackage[l2tabu]{nag}        
\makeatletter
\renewcommand*\cleardoublepage{\clearpage\if@twoside
  \ifodd\c@page \hbox{}\newpage\if@twocolumn\hbox{}%
  \newpage\fi\fi\fi}
\makeatother
\documentclass[a4paper,12pt,openany,leqno,footinclude=true]{memoir} 
\usepackage{enumitem}% http://ctan.org/pkg/enumitem
\usepackage{graphicx}
\usepackage{amssymb}
\usepackage{lineno}
\usepackage{multicol}
\usepackage{blindtext}
\RequirePackage{graphicx}

\usepackage{enumitem}
\setlist[itemize]{leftmargin=*}
%\usepackage{amsmath,fontspec}

\usepackage{subfig}
\usepackage{amsfonts}
\usepackage{algorithm,algorithmic}
\usepackage{enumitem}
\usepackage{eqparbox}
\setlist[itemize]{leftmargin=*}
\def\cftchapteraftersnum{.}
\makeatletter
\def\@copyrightspace{\relax}
\makeatother

\settrimmedsize{297mm}{210mm}{*}
\setlength{\trimtop}{0pt} 
\setlength{\trimedge}{\stockwidth} 
\addtolength{\trimedge}{-\paperwidth} 
\settypeblocksize{634pt}{448.13pt}{*} 
\setulmargins{4 cm}{*}{*} 
\setlrmargins{*}{*}{1.5} 
\setmarginnotes{17pt}{51pt}{\onelineskip} 
\setheadfoot{\onelineskip}{2\onelineskip} 
\setheaderspaces{*}{2\onelineskip}{*} 
\setlrmargins{*}{*}{1}
\checkandfixthelayout
\pagestyle {plain}
\usepackage{fouriernc}
\usepackage[T1]{fontenc}
\aliaspagestyle{part}{empty}
\OnehalfSpacing 

\newcommand{\clearemptydoublepage}{\newpage{\thispagestyle{empty}\cleardoublepage}}

\usepackage{import}
\usepackage{underscore}     
% Add other packages needed for chapters here. For example:
\usepackage{lipsum}                 %Needed to create dummy text
\usepackage{amsfonts}                   %Calls Amer. Math. Soc. (AMS) fonts
\usepackage[centertags]{amsmath}            %Writes maths centred down
\usepackage{stmaryrd}                   %New AMS symbols
\usepackage{amssymb}                    %Calls AMS symbols
\usepackage{amsthm}                 %Calls AMS theorem environment
\usepackage{newlfont}                   %Helpful package for fonts and symbols
\usepackage{layouts}                    %Layout diagrams
\usepackage{graphicx}                   %Calls figure environment
\usepackage{longtable,rotating}         %Long tab environments including rotation. 
\usepackage[applemac]{inputenc}         %Needed to encode non-english characters 
                                    %directly for mac
\usepackage{colortbl}                   %Makes coloured tables
\usepackage{wasysym}                    %More math symbols
\usepackage{mathrsfs}                   %Even more math symbols
\usepackage{float}                      %Helps to place figures, tables, etc. 
\usepackage{verbatim}                   %Permits pre-formated text insertion
\usepackage{upgreek }                   %Calls other kind of greek alphabet
\usepackage{latexsym}                   %Extra symbols
\usepackage[square,numbers,
             sort&compress]{natbib}     %Calls bibliography commands 
\usepackage{url}                        %Supports url commands
\usepackage{etex}                       %eTeXÕs extended support for counters
\usepackage{fixltx2e}                   %Eliminates some in felicities of the 
                                    %original LaTeX kernel
\usepackage[spanish,english]{babel}     %For languages characters and hyphenation
\usepackage{color}                                  %Creates coloured text and background
\usepackage[colorlinks=true,
             allcolors=black]{hyperref}              %Creates hyperlinks in cross references
\usepackage{memhfixc}                   %Must be used on memoir document 
                                    %class after hyperref
\usepackage{enumerate}                  %For enumeration counter
\usepackage{footnote}                   %For footnotes
\usepackage{microtype}                  %Makes pdf look better.
\usepackage{rotfloat}                   %For rotating and float environments as tables, 
                                    %figures, etc. 
\usepackage{alltt}                      %LaTeX commands are not disabled in 
                                    %verbatim-like environment
\usepackage[version=0.96]{pgf}          %PGF/TikZ is a tandem of languages for producing vector graphics from a 
\usepackage{tikz}                       %geometric/algebraic description.
\usetikzlibrary{arrows,shapes,snakes,
               automata,backgrounds,
               petri,topaths}               %To use diverse features from tikz      


%
\usepackage{mathptmx}% http://ctan.org/pkg/mathptmx
\setcounter{tocdepth}{3}
\setcounter{secnumdepth}{3}

\usepackage{tocloft}%
\newcommand{\cftchapaftersnum}{.}
\begin{document}
% -----------------------------------------------------------Pages
\let\cleardoublepage\clearpage

\input{frontmatter/title}

\end{document}

以上为序言。

考虑放入 title.tex：

\[dupthresh = D\cdot[1+log(n)]\]

= 未出现。

一个简单的例子如下：

\documentclass{article}
\usepackage{fouriernc}
\usepackage{mathptmx}
\begin{document}
$a=b$
\end{document}

答案1

具体错误是，文档加载了两个不兼容的数学模式重新定义，fouriernc但mathptmx更一般的是，序言加载多种的很多文件被打包了三四次，而且由于已经很广泛的memoir类被用作基础，所以大多数文件都是不需要的。它还加载了newlfont、etex，fixltx2e这些文件不应与当前版本一起使用。（newlfont应该只用于处理 1993 年 latex2e 发布之前的文档）。序言也定义了\cleardoublepage两次，定义不同，并指定了\usepackage[applemac]{inputenc}哪种编码不太可能是现代文本编辑器使用的编码，即使在 Mac 上也是如此。

我的建议是将文档更改为开始

\documentclass{memoir}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\begin{document}

然后仅在需要时添加更多包。

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