What is the best way to avoid overful hbox in this situation?(mathematics)

Question

I am writing some mathematical symbols which gives me an overful hbox, please see the picture.

The code is

\documentclass[a4paper,draft]{memoir}
\RequirePackage{amsthm}
\usepackage{amssymb}              
\usepackage{amsmath}
\newtheorem{Co}{Corollary}
\numberwithin{Co}{section}

\begin{document}
\chapter{first chapter}
\section{first section}
\begin{Co}
Let $\{P_n\}$ be a collection of probability measures on $(C[0,\infty),\mathcal{C})$.
Such that etc.etc.
\end{Co}
\end{document}

What would be a good way to fix this? One idea I have is using "align" but it seems overkill to get the mathematical symbol on a new line in the middle of the page. Are there any good ways to write this to not get an overful hbox?

Answer 1

This shows the problem, plus 3 ways to deal with it:

1. Specify a breakpoint manually within the long math expression, $(C[0,\infty),\allowbreak\mathcal{C})$

2. Invoke \sloppy within the corollary.

3. Reword the corollary, as suggested by Bernard and Henri, to avoid the problem to begin with.

The MWE:

\documentclass[a4paper,draft]{memoir}
\RequirePackage{amsthm}
\usepackage{amssymb}              
\usepackage{amsmath}
\newtheorem{Co}{Corollary}
\numberwithin{Co}{section}
\usepackage{lipsum}
\begin{document}
\chapter{first chapter}
\section{first section}
\lipsum[1]
\begin{Co}
  Let $\{P_n\}$ be a collection of probability measures on
  $(C[0,\infty),\mathcal{C})$.  Such that etc.etc.
\end{Co}
\begin{Co}
  Let $\{P_n\}$ be a collection of probability measures on
  $(C[0,\infty),\allowbreak\mathcal{C})$.  Such that etc.etc.
\end{Co}
\begin{Co}
  \sloppy
  Let $\{P_n\}$ be a collection of probability measures on
  $(C[0,\infty),\mathcal{C})$.  Such that etc.etc.
\end{Co}
\begin{Co}
  Let the set $\{P_n\}$ be a collection of probability measures on
  $(C[0,\infty),\mathcal{C})$.  Such that etc.etc.
\end{Co}

\end{document}

Answer 2

Since you say that, "any good ways to write this to not get an overful hbox", I presume that you are more concerned about the irritating messages, and will not mind a bit overfull horizontal material so long as the looks are not destroyed.

Here is one technique I employ more than often.

---

\documentclass[a4paper,draft]{memoir}
\RequirePackage{amsthm}
\usepackage{amssymb}              
\usepackage{amsmath}
\newtheorem{Co}{Corollary}
\numberwithin{Co}{section}

\begin{document}
\chapter{first chapter}
\section{first section}
\begin{Co}
  \hfuzz\maxdimen
  Let $\{P_n\}$ be a collection of probability measures on
  $(C[0,\infty),\mathcal{C})$.  Such that etc.etc.
\end{Co}
\end{document}

---

---

\hfuzz=[length] is a parameter that allows hbox's to be overfull by [length] before an overfull error occurs. When we set this to \maxdimen, an overfull hbox never occurs.

\maxdimen is the largest dimension, but not the largest number.