\documentclass[a4paper,titlepage,oneside, reqno]{amsart}
\usepackage[left=2.7cm, right=2.5cm, top=3cm]{geometry}
\usepackage[utf8]{inputenc}
\usepackage[dutch,polish,swedish,french,german,russian,main=english]{babel}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[tipa,combine]{ucs}
\usepackage[numbers]{natbib}
\usepackage[colorlinks]{hyperref}
\hypersetup{colorlinks,linkcolor={green!55!black},citecolor={green!55!black},urlcolor={green!55!black}}
\usepackage{url}
\usepackage[pdftex]{graphicx}
\usepackage{amsthm,amssymb,bm}
\usepackage{thmtools}
\usepackage{environ}
\usepackage{nicefrac}
\usepackage[dvipsnames]{xcolor}
\usepackage{tikz}
\usepackage[affil-it]{authblk}
\usepackage{epstopdf}
\usepackage{amsfonts,amssymb,amsbsy}
\usepackage{mathtools}
\usepackage{amsmath}
\usepackage{nccmath}
\usepackage{tabu}
\usepackage{tabularx}
\usepackage{multirow}
\usepackage{bbm}
\usepackage{comment}
\usepackage{microtype}
\usepackage{placeins}
\makeatletter
\let\mytagform@=\tagform@
\def\tagform@#1{\maketag@@@{\color{green!55!black}(#1)}}
\makeatother
\renewcommand{\eqnumcolor}{\color{green!55!black}}
\newtheorem{theorem}{Theorem}[section]
\newtheorem{lemma}[theorem]{Lemma}
\newtheorem{proposition}[theorem]{Proposition}
\newtheorem{corollary}[theorem]{Corollary}
\newtheorem{observation}[theorem]{Observation}
\newtheorem{definition}[theorem]{Definition}
\newtheorem{remark}[theorem]{Remark}
\newtheorem{example}[theorem]{Example}
\newtheorem{assumption}[theorem]{Assumption}
\newtheorem{problem}[theorem]{Problem}
\parindent0mm
\usepackage{helvet}
\usepackage{titlesec}
\titleformat{\chapter}
{\normalfont\fontsize{12}{15}\sffamily\bfseries}
{\thechapter}
{1em}
{}
\titleformat{\section}
{\normalfont\fontsize{10}{15}\sffamily\bfseries}
{\thesection}
{1em}
{}
\titleformat{\subsection}
{\normalfont\fontsize{10}{15}\sffamily\bfseries\slshape}
{\thesubsection}
{1em}
{}`enter code here`
您好！我正在使用上述模板，但在 overleaf 文件中出现了以下错误，
(1)LaTeX Error: Command `\lll' already defined.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.156 ...mbol{\lll} {\mathrel}{AMSa}{"6E}
Your command was ignored.
Type I <command> <return> to replace it with another command,
or <return> to continue without it.
(2)LaTeX Error: \eqnumcolor undefined.
X manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.36 \renewcommand{\eqnumcolor}
{\color{green!55!black}}
Try typing <return> to proceed.
If that doesn't work, type X <return> to quit.
\c@theorem=\count160
(/usr/local/texlive/2017/texmf-dist/tex/latex/psnfss/helvet.sty
Package: helvet 2005/04/12 PSNFSS-v9.2a (WaS)
) (/usr/local/texlive/2017/texmf-dist/tex/latex/titlesec/titlesec.sty
Package: titlesec 2016/03/21 v2.10.2 Sectioning titles
\ttl@box=\box45
\beforetitleunit=\skip74
\aftertitleunit=\skip75
\ttl@plus=\dimen268
\ttl@minus=\dimen269
\ttl@toksa=\toks56
\titlewidth=\dimen270
\titlewidthlast=\dimen271
\titlewidthfirst=\dimen272
) (/compile/output.aux)
\openout1 = `output.aux'.
(3) Misplaced alignment tab character &.
You have placed an alignment tab character '&' in the wrong place. If you want to align something, you must write it inside an align environment such as \begin{align} … \end{align}, \begin{tabular} … \end{tabular}, etc. If you want to write an ampersand '&' in text, you must write \& instead.
Learn more
l.704 \newblock {\em Chaos, Solitons &
Fractals}, 4(10):1965 -- 1968, 1994.
I can't figure out why you would want to use a tab mark
here. If you just want an ampersand, the remedy is
simple: Just type `I\&' now. But if some right brace
up above has ended a previous alignment prematurely,
you're probably due for more error messages, and you
might try typing `S' now just to see what is salvageable.
(4) Package inputenc Error: Unicode char ℓ (U+2113)
(inputenc) not set up for use with LaTeX.
See the inputenc package documentation for explanation.
Type H <return> for immediate help.
...
l.1506 ...iterated function systems defined on ℓ
∞-sum of a
Your command was ignored.
Type I <command> <return> to replace it with another command,
or <return> to continue without it.
(5) Package inputenc Error: Unicode char ∞ (U+221E)
(inputenc) not set up for use with LaTeX.
See the inputenc package documentation for explanation.
Type H <return> for immediate help.
...
l.1506 ...rated function systems defined on ℓ∞
-sum of a
Your command was ignored.
Type I <command> <return> to replace it with another command,
or <return> to continue without it.
(6) Package inputenc Error: Unicode char ̧ (U+327)
(inputenc) not set up for use with LaTeX.
See the inputenc package documentation for explanation.
Type H <return> for immediate help.
...
l.1806 Maciej Sļ
eczka.
Your command was ignored.
Type I <command> <return> to replace it with another command,
or <return> to continue without it.
感谢您提供任何帮助来消除此类错误。尤其是帮助我构建 usepackages 列表和其他内容以在 overleaf 中获得无错误的输出。谢谢
答案1
初始错误是
babel/polish和amssymb包之间不兼容，正如你通过这个最小的例子所观察到的：\documentclass{article} \usepackage[polish]{babel} \usepackage{amssymb} \begin{document} \end{document}加载包后添加以下几行
babel。\usepackage[dutch,polish,swedish,french,german,russian,main=english]{babel} \let\plll\lll \let\lll\relax关于第二个错误
\eqnumcolor未定义，请替换\renewcommand为\newcommand（您发布的代码的第 36 行）在参考书目中，将字符串中的
Chaos, Solitons & Fractals替换&为\&。显然您正在写数学。在这种情况下，请使用数学模式和提供的数学符号命令。您可能想写
$\ell_\infty$（抛光 l 下标无穷大）或（抛光 l 上标无穷大），而不是 ℓ∞。如果 l 符号是包含在包选项中的$\ell^\infty$唯一原因，那么删除它，您就不需要上面的第一个修复。polishbabel在名称中
Maciej Sļeczka，不要使用l变音符unicode后面的字母，而要使用ļ已经包含变音符的字母（例如，如果您不知道如何输入，请从此帖子中复制）。