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I have the following code, which runs and formats nicely.

\documentclass[a4paper,11pt]{book} \usepackage[T1]{fontenc} \usepackage[utf8]{inputenc} \usepackage{lmodern} \usepackage{classicthesis} \usepackage[english]{babel} \usepackage{mathtools} \usepackage{enumitem} \begin{document} \section*{Examples} For each function $f$ given, \begin{enumerate} \begin{enumerate} \item Sketch the graph of $f.$ \item Write the open intervals for which $f$ is continuous. \item Write the open intervals for which $f$ is increasing. \item Write the open intervals for which $f$ is decreasing. \item Write the open intervals for which $f$ is concave up. \item Write the open intervals for which $f$ is concave down. \end{enumerate} \item $f(x)=x^3-x^2-x+1.$ \item $f(x)=\dfrac{x^2-2x+2}{x-1}.$ \item $f(x)=x\sqrt{3-x}.$ \item $f(x)=\dfrac{x^3}{36}\sqrt{7-x}.$ \end{enumerate} \end{document}

But it gives a missing \item error. The result,

output

How should I edit the code to avoid the error, yet keep the same format and output?

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    I tried to compile your document. It's by far not minimal and it stops due to some issue with xy package. Now, commenting that out, the remaining issue is, that enumerate expects an \item, not another \begin{enumerate} Commented Aug 2, 2015 at 22:55
  • @ChristianHupfer I've edited out the unnecessary packages. Minimal as much as possible to show the output I want. Commented Aug 2, 2015 at 22:59
  • @ChristianHupfer which is why I asked the question! Commented Aug 2, 2015 at 23:00
  • Well, lmodern is certainly unnecessary as it will have no effect at all on your document. mathtools loads amsmath anyway. Better xcolor than color. Also, it would be better to use scrbook with classicthesis. It would also be better not to use classicthesis, but that's a different issue. Finally, tabu cannot be recommended if you hope your document will remain compilable in the future as the author has promised backwards incompatible changes. Once that happens, documents which use it will break. Commented Aug 2, 2015 at 23:02
  • And how is appendix necessary here? Or hyperref? You don't really need anything except the document class and enumitem, do you? Commented Aug 2, 2015 at 23:04

2 Answers 2

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You can do what you want with a simple empty \item:

\documentclass[a4paper,11pt]{book} \usepackage[T1]{fontenc} \usepackage[utf8]{inputenc} \usepackage{lmodern} \usepackage{classicthesis} \usepackage[english]{babel} \usepackage{mathtools} \usepackage{enumitem} \begin{document} \section*{Examples} For each function $f$ given, \begin{enumerate} \item[]% \begin{enumerate}[before = \vspace*{-\topsep}] \item Sketch the graph of $f.$ \item Write the open intervals for which $f$ is continuous. \item Write the open intervals for which $f$ is increasing. \item Write the open intervals for which $f$ is decreasing. \item Write the open intervals for which $f$ is concave up. \item Write the open intervals for which $f$ is concave down. \end{enumerate} \item $f(x)=x^3-x^2-x+1.$ \item $f(x)=\dfrac{x^2-2x+2}{x-1}.$ \item $f(x)=x\sqrt{3-x}.$ \item $f(x)=\dfrac{x^3}{36}\sqrt{7-x}.$ \end{enumerate} \end{document}

enter image description here

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  • nice, and carries even closer to my vertical spacing from before - but i wouldn't have known how to deal with the \vspace command you used. Commented Aug 2, 2015 at 23:38
  • All lists add a \topsep vertical spacing at the beginning at at the end. I simply neutralised it at the top. Commented Aug 3, 2015 at 0:18
  • because empty item would add a space there, right? Commented Aug 3, 2015 at 0:29
  • No it doen'st, if there is nothing after (that's the reason of the %: prevent any unwanted space). It's the nested enumerate that adds \topsep – as far as I understand it. Commented Aug 3, 2015 at 0:33
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here is a solution

\documentclass[a4paper,11pt]{book} \usepackage[T1]{fontenc} \usepackage[utf8]{inputenc} \usepackage{lmodern} \usepackage{classicthesis} \usepackage{hyperref} \usepackage{graphicx} \usepackage[english]{babel} \usepackage{amsmath,mathtools} \usepackage{amsfonts} \usepackage{color} \usepackage{url} \usepackage{enumitem} \usepackage{multicol} \usepackage{tabu} \usepackage{amsthm} \usepackage{fourier-orns} \usepackage{framed} \usepackage{tcolorbox} \usepackage[toc,page]{appendix} \usepackage[all]{xy} \begin{document} \section*{Examples} For each function $f$ given, \begin{enumerate}[label=\alph*),leftmargin=2\leftmargini] \item Sketch the graph of $f.$ \item Write the open intervals for which $f$ is continuous. \item Write the open intervals for which $f$ is increasing. \item Write the open intervals for which $f$ is decreasing. \item Write the open intervals for which $f$ is concave up. \item Write the open intervals for which $f$ is concave down. \end{enumerate} \begin{enumerate} \item $f(x)=x^3-x^2-x+1.$ \item $f(x)=\dfrac{x^2-2x+2}{x-1}.$ \item $f(x)=x\sqrt{3-x}.$ \item $f(x)=\dfrac{x^3}{36}\sqrt{7-x}.$ \end{enumerate} \end{document}

enter image description here

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  • Sorry, I liked the elimination of topsep as it keeps the original formatting I had earlier in that regard. Thanks though for your answer! Commented Aug 3, 2015 at 1:04

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