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I'm trying to add an equation to my paper and the result is as I want. However, I get the warning:

Underfull \hbox (badness 10000) in paragraph at lines 4--12

What does it mean and how can I get rid of it?

Here is the code:

(time)=$\frac{\displaystyle\sum_{n=1}^{i} U_i*t_i}{U_top}$ \newline
\newline
koleygr
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Alp Erbil
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  • Welcome to TeX.SX! \newline command creates this warning because it finds an end of line caused by something external of the line break internal rules. Generally (depending on your code and the wanted output) using \newline is not recommended except of special cases and if possible you should prefer a \vspace{\baselineskip} or a \linebreak or not-inline math etc. But This warning is nothing to worry about if you wish to have a new line at this specific place and you may ignore that. It is not an error. – koleygr Jul 15 '19 at 15:08
  • never use two consecutive \newline or a \newline at the end of a paragraph. – David Carlisle Jul 15 '19 at 15:11
  • possible duplicate https://tex.stackexchange.com/questions/334246/what-does-the-phrase-underfull-hbox-badness-10000-in-paragraph-actually-mea/334249#334249 – David Carlisle Jul 15 '19 at 15:12
  • This is a guess: you want an unnumbered display equation. For that, a better formulation is \[\textrm{time} = \frac{\displaystyle\sum_{n=1}^{i} U_i*t_i}{U_top}\] – barbara beeton Jul 15 '19 at 15:12
  • unrelated but you have the = outside of math so will get the wrong spacing, and I would mark that as \[(\mathrm{time})=\frac{\sum_{n=1}^{i} U_i*t_i}{U_{\mathrm{top}}\] – David Carlisle Jul 15 '19 at 15:14
  • @DavidCarlisle -- no \\ here. – barbara beeton Jul 15 '19 at 15:15
  • @koleygr I would worry about it if it were my document, I don't think it is good to advise this error can be ignored, the spurious line that it is warning about has very bad behaviour at a page break for example. – David Carlisle Jul 15 '19 at 15:15
  • @barbarabeeton \\ and \newline are the same thing. – David Carlisle Jul 15 '19 at 15:16
  • @DavidCarlisle .. I am talking general and this is a warning ... Had in mind something like \noindent {\bfseries Question 1:}\newline This is the body of the question that I suppose this same warning is ok... Added some solutions too and suggested to avoid it for this case. – koleygr Jul 15 '19 at 15:18
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    @koleygr there would not be a warning from such a use. – David Carlisle Jul 15 '19 at 15:20
  • @DavidCarlisle ... just tested and show that ... I didn't knew that. Thanks – koleygr Jul 15 '19 at 15:22
  • @DavidCarlisle -- But that's not obvious, requires digging. (I'm standing up here for newbies and forgetful senior citizens.) – barbara beeton Jul 15 '19 at 15:56
  • Yes that's why I linked to a question about the message not one asking about \\ – David Carlisle Jul 15 '19 at 16:39

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