# Underfull \hbox (badness 10000) in paragraph at lines 106--107 [duplicate]

Recently, LaTeX always shows

"Underfull \hbox (badness 10000) in paragraph at lines 106--107

Trial:

   \documentclass{ctexart}
\usepackage{color}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{epstopdf}
\hfuzz=\maxdimen
\tolerance=10000
\begin{document}

$(A \pm B)^{-1} \neq A^{-1} \pm B^{-1}$,$(A \pm B)^* \neq A^* \pm B^*$~\
$|(A^*)^*|=|A|^{n^2-2 n+1}$~\
\end {document}


My question :How to revise it?

And I found the code that cotains the "~\\" and blank line always shows the warning imformation "Underfull \hbox (badness 10000) in paragraph at lines"

## marked as duplicate by Joseph Wright♦Dec 18 '13 at 11:15

• Welcome to TeX.SX. You will need to provide a little bit more details about your document so that we can better assist you. For example, start by providing a minimal working example that illustrates the problem hereby spoken of. – azetina Dec 17 '13 at 15:38
• give us a clue: what does your source look like on lines 106-107 ? – David Carlisle Dec 17 '13 at 15:42
• @David Carlisle,Dear David Carlisle,I found the code that cotains the "~\\" and blank line always shows the warning imformation "Underfull \hbox (badness 10000) in paragraph at lines" – abc Dec 18 '13 at 1:55
• @tangshutao yes well, I could have guessed that it was \\  at the end of a paragraph. Never do that. – David Carlisle Dec 18 '13 at 9:17
• Simply remove the  ~\\  It is always wrong to end a paragraph with \\  (and always wrong to have ~ at the end of a line) – David Carlisle Dec 18 '13 at 9:19

You really don't want to set \hfuzz etc that way or tex will produce truly unreadable documents with no warning.

  \documentclass{ctexart}
\usepackage{color}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{epstopdf}
%   \hfuzz=\maxdimen
%   \tolerance=10000