Page Layout ⇒ How to avoid orphans when creating environment?

[yoyoimut]

Orphan

orphan.jpg (190.35 KiB) Viewed 2495 times

Hi,


I am creating an environment just for the sake of illustration according to the following code:

Code: Select all

\documentclass{book}
\usepackage[a4paper,vmargin=7cm]{geometry}
\usepackage{multido,lipsum}

\newcounter{exercise}
\newenvironment{Exercise}{%
\refstepcounter{exercise}%
\vspace{10pt}\par\noindent%
\textbf{Exercise} \theexercise%
\begin{itshape}%
\par\noindent\ignorespaces}
{\end{itshape}\vspace{10pt}\par}


\begin{document}
\multido{\i=1+1}{30}{%
\begin{Exercise}
\lipsum[1-5]
\end{Exercise}}
\end{document}

My question is

1. how to force latex to avoid generating orphan?
2. is theorem environments (from amsthm.sty) orphan-free?

Thank you in advance.



Yuko.

[kaiserkarl13]

I'm not sure if this works in all situations, but it solved the problem for your example.

Place \nopagebreak in front of the \par command in the definition of your environment:

Code: Select all

\newenvironment{Exercise}{%
   \refstepcounter{exercise}%
   \vspace{10pt}\par\noindent%
   \textbf{Exercise} \theexercise%
   \begin{itshape}%
   \nopagebreak\par\noindent\ignorespaces}
{\end{itshape}\vspace{10pt}\par}

To prevent orphans ("clubbed lines") and widows in the body text, use the following commands:

Code: Select all

\clubpenalty=10000
\widowpenalty=10000

[yoyoimut]

Thanks kaiserkarl13, well done!


regards,

Yuko