我发现在转换为 pdf 格式时，jupyter notebook 中的一些 unicode 字符无法正确转换。
上图显示的是转换后的 PDF 输出。下图显示的是原始 PDF
我已经安装了 texlive texlive-extra 和 pandoc 包。我尝试使用 pdflatex 引擎执行此操作。最奇怪的是，alpha 希腊字母确实出现在代码框外，但不在代码框内。其他字母（如 theta）完全消失了。
从生成的 tex 文件中我发现以下与字体相关的内容
\usepackage{iftex}
\ifPDFTeX
\usepackage[T1]{fontenc}
\usepackage{mathpazo}
\else
\usepackage{fontspec}
\fi
在下面的代码片段中，有一个 alpha 出现的例子，还有一个没有出现的例子。看起来它们的定义不同。
\hypertarget{integrate-to-find-alpha_l0}{%
\subsection{\texorpdfstring{Integrate to find
\(\alpha_{L=0}\)}{Integrate to find \textbackslash alpha\_\{L=0\}}}\label{integrate-to-find-alpha_l0}}
\begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{72}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{n}{α\PYZus{}rad} \PY{o}{=} \PY{o}{\PYZhy{}}\PY{p}{(}\PY{l+m+mi}{1}\PY{o}{/}\PY{n+nb}{π}\PY{p}{)}\PY{o}{*}\PY{n}{integrate}\PY{p}{(}\PY{n}{cc\PYZus{}f′}\PY{p}{(}\PY{n}{θ}\PY{p}{)}\PY{p}{,}\PY{p}{(}\PY{n}{θ}\PY{p}{,}\PY{l+m+mi}{0}\PY{p}{,}\PY{n}{middleLimit}\PY{p}{)}\PY{p}{)} \PY{o}{\PYZhy{}}\PY{p}{(}\PY{l+m+mi}{1}\PY{o}{/}\PY{n+nb}{π}\PY{p}{)}\PY{o}{*}\PY{n}{integrate}\PY{p}{(}\PY{n}{cc\PYZus{}r′}\PY{p}{(}\PY{n}{θ}\PY{p}{)}\PY{p}{,}\PY{p}{(}\PY{n}{θ}\PY{p}{,}\PY{n}{middleLimit}\PY{p}{,}\PY{n+nb}{π}\PY{p}{)}\PY{p}{)}
\PY{n}{α\PYZus{}deg} \PY{o}{=} \PY{n}{float}\PY{p}{(}\PY{n}{rad2deg}\PY{p}{(}\PY{n}{α\PYZus{}rad}\PY{p}{)}\PY{p}{)}
\PY{n}{println}\PY{p}{(}\PY{n}{α\PYZus{}rad}\PY{p}{)}
\PY{n}{println}\PY{p}{(}\PY{n}{α\PYZus{}deg}\PY{p}{)}
\end{Verbatim}
\end{tcolorbox}
\documentclass[11pt]{article}
\usepackage[breakable]{tcolorbox}
\usepackage{parskip} % Stop auto-indenting (to mimic markdown behaviour)
\usepackage{iftex}
\ifPDFTeX
\usepackage[T1]{fontenc}
\usepackage{mathpazo}
\else
\usepackage{fontspec}
\fi
% Basic figure setup, for now with no caption control since it's done
% automatically by Pandoc (which extracts  syntax from Markdown).
\usepackage{graphicx}
% Maintain compatibility with old templates. Remove in nbconvert 6.0
\let\Oldincludegraphics\includegraphics
% Ensure that by default, figures have no caption (until we provide a
% proper Figure object with a Caption API and a way to capture that
% in the conversion process - todo).
\usepackage{caption}
\DeclareCaptionFormat{nocaption}{}
\captionsetup{format=nocaption,aboveskip=0pt,belowskip=0pt}
\usepackage{float}
\floatplacement{figure}{H} % forces figures to be placed at the correct location
\usepackage{xcolor} % Allow colors to be defined
\usepackage{enumerate} % Needed for markdown enumerations to work
\usepackage{geometry} % Used to adjust the document margins
\usepackage{amsmath} % Equations
\usepackage{amssymb} % Equations
\usepackage{textcomp} % defines textquotesingle
% Hack from http://tex.stackexchange.com/a/47451/13684:
\AtBeginDocument{%
\def\PYZsq{\textquotesingle}% Upright quotes in Pygmentized code
}
\usepackage{upquote} % Upright quotes for verbatim code
\usepackage{eurosym} % defines \euro
\usepackage[mathletters]{ucs} % Extended unicode (utf-8) support
\usepackage{fancyvrb} % verbatim replacement that allows latex
\usepackage{grffile} % extends the file name processing of package graphics
% to support a larger range
\makeatletter % fix for old versions of grffile with XeLaTeX
\@ifpackagelater{grffile}{2019/11/01}
{
% Do nothing on new versions
}
{
\def\Gread@@xetex#1{%
\IfFileExists{"\Gin@base".bb}%
{\Gread@eps{\[email protected]}}%
{\Gread@@xetex@aux#1}%
}
}
\makeatother
\usepackage[Export]{adjustbox} % Used to constrain images to a maximum size
\adjustboxset{max size={0.9\linewidth}{0.9\paperheight}}
% The hyperref package gives us a pdf with properly built
% internal navigation ('pdf bookmarks' for the table of contents,
% internal cross-reference links, web links for URLs, etc.)
\usepackage{hyperref}
% The default LaTeX title has an obnoxious amount of whitespace. By default,
% titling removes some of it. It also provides customization options.
\usepackage{titling}
\usepackage{longtable} % longtable support required by pandoc >1.10
\usepackage{booktabs} % table support for pandoc > 1.12.2
\usepackage[inline]{enumitem} % IRkernel/repr support (it uses the enumerate* environment)
\usepackage[normalem]{ulem} % ulem is needed to support strikethroughs (\sout)
% normalem makes italics be italics, not underlines
\usepackage{mathrsfs}
% Colors for the hyperref package
\definecolor{urlcolor}{rgb}{0,.145,.698}
\definecolor{linkcolor}{rgb}{.71,0.21,0.01}
\definecolor{citecolor}{rgb}{.12,.54,.11}
% ANSI colors
\definecolor{ansi-black}{HTML}{3E424D}
\definecolor{ansi-black-intense}{HTML}{282C36}
\definecolor{ansi-red}{HTML}{E75C58}
\definecolor{ansi-red-intense}{HTML}{B22B31}
\definecolor{ansi-green}{HTML}{00A250}
\definecolor{ansi-green-intense}{HTML}{007427}
\definecolor{ansi-yellow}{HTML}{DDB62B}
\definecolor{ansi-yellow-intense}{HTML}{B27D12}
\definecolor{ansi-blue}{HTML}{208FFB}
\definecolor{ansi-blue-intense}{HTML}{0065CA}
\definecolor{ansi-magenta}{HTML}{D160C4}
\definecolor{ansi-magenta-intense}{HTML}{A03196}
\definecolor{ansi-cyan}{HTML}{60C6C8}
\definecolor{ansi-cyan-intense}{HTML}{258F8F}
\definecolor{ansi-white}{HTML}{C5C1B4}
\definecolor{ansi-white-intense}{HTML}{A1A6B2}
\definecolor{ansi-default-inverse-fg}{HTML}{FFFFFF}
\definecolor{ansi-default-inverse-bg}{HTML}{000000}
% common color for the border for error outputs.
\definecolor{outerrorbackground}{HTML}{FFDFDF}
% commands and environments needed by pandoc snippets
% extracted from the output of `pandoc -s`
\providecommand{\tightlist}{%
\setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}
\DefineVerbatimEnvironment{Highlighting}{Verbatim}{commandchars=\\\{\}}
% Add ',fontsize=\small' for more characters per line
\newenvironment{Shaded}{}{}
\newcommand{\KeywordTok}[1]{\textcolor[rgb]{0.00,0.44,0.13}{\textbf{{#1}}}}
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\newcommand{\RegionMarkerTok}[1]{{#1}}
\newcommand{\ErrorTok}[1]{\textcolor[rgb]{1.00,0.00,0.00}{\textbf{{#1}}}}
\newcommand{\NormalTok}[1]{{#1}}
% Additional commands for more recent versions of Pandoc
\newcommand{\ConstantTok}[1]{\textcolor[rgb]{0.53,0.00,0.00}{{#1}}}
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\newcommand{\AnnotationTok}[1]{\textcolor[rgb]{0.38,0.63,0.69}{\textbf{\textit{{#1}}}}}
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\newcommand{\AttributeTok}[1]{\textcolor[rgb]{0.49,0.56,0.16}{{#1}}}
\newcommand{\InformationTok}[1]{\textcolor[rgb]{0.38,0.63,0.69}{\textbf{\textit{{#1}}}}}
\newcommand{\WarningTok}[1]{\textcolor[rgb]{0.38,0.63,0.69}{\textbf{\textit{{#1}}}}}
% Define a nice break command that doesn't care if a line doesn't already
% exist.
\def\br{\hspace*{\fill} \\* }
% Math Jax compatibility definitions
\def\gt{>}
\def\lt{<}
\let\Oldtex\TeX
\let\Oldlatex\LaTeX
\renewcommand{\TeX}{\textrm{\Oldtex}}
\renewcommand{\LaTeX}{\textrm{\Oldlatex}}
% Document parameters
% Document title
\title{Untitled}
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\def\PY@toks#1+{\ifx\relax#1\empty\else%
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\def\PY@do#1{\PY@bc{\PY@tc{\PY@ul{%
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% For linebreaks inside Verbatim environment from package fancyvrb.
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% Slightly bigger margins than the latex defaults
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\begin{document}
\maketitle
\hypertarget{change-of-coordinate-system}{%
\subsection{Change of coordinate
system}\label{change-of-coordinate-system}}
To be able to solve the equations it is necessary to perform a cordinate
change from x to \(\theta\).
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\prompt{In}{incolor}{4}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{k}{using} \PY{n}{SymPy}
\PY{n}{θ} \PY{o}{=} \PY{n}{Sym}\PY{p}{(}\PY{l+s}{\PYZdq{}}\PY{l+s}{θ}\PY{l+s}{\PYZdq{}}\PY{p}{)}
\PY{n}{varChange} \PY{o}{=} \PY{l+m+mf}{0.5}\PY{p}{(}\PY{l+m+mi}{1} \PY{o}{\PYZhy{}} \PY{n}{cos}\PY{p}{(}\PY{n}{θ}\PY{p}{)}\PY{p}{)}
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\prompt{Out}{outcolor}{4}{}
$\begin{equation*}0.5 - 0.5 \cos{\left(θ \right)}\end{equation*}$
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答案1
! Package inputenc Error: Unicode character θ (U+03B8)
(inputenc) not set up for use with LaTeX.
意味着 theta 未设置，因此：
\ifPDFTeX
\usepackage[T1]{fontenc}
\usepackage{mathpazo}
\DeclareUnicodeCharacter{03B8}{\ensuremath{\theta}}
\else
\usepackage{fontspec}
\fi
和
! LaTeX Error: Bad math environment delimiter.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.403 $\begin{equation*}
0.5 - 0.5 \cos{\left(θ \right)}\end{equation*}$
?
是因为equation*已经在数学模式中启动，删除了虚假的$
\begin{equation*}0.5 - 0.5 \cos{\left(θ \right)}\end{equation*}
然后文档运行，不会出现错误。请注意，不要忽略错误，如果 LaTeX 出现错误，则不值得查看生成的 PDF，如果寻求帮助，最好显示错误消息，而不是 pdf 输出。