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I don't know why but with this code, Latex provide me a new line after each \wedge and some weird spaces after \alpha and \notin

$\rightarrow$= \parbox{5.5cm}{
$\{((s_1,s_2),\alpha,(s_1',s_2)) | \alpha \notin H \wedge (s_1,\alpha,s_1') \in \rightarrow 1 \} \cup$  \\ 
$\{((s_1,s_2),\alpha,(s_1,s_2')) | \alpha \notin H \wedge (s_2,\alpha,s_2') \in \rightarrow 2 \} \cup$  \\ 
$\{((s_1,s_2),\alpha,(s_1',s_2'))| \alpha \notin H \wedge (s_1,\alpha,s_1') \in \rightarrow 1 \cap (s_2,\alpha,s_2') \in \rightarrow 2 \}$

}

I would like to write it in only 4 lines and without these spaces while there is enough space to write it on one line. I would like to write it in only 4 lines and without these spaces

I'm using the package amsmath (but i'm not sure it's related).

How can i do this? Thanks.

|improve this question
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    Welcome to TeX.SX! Please help us (and also you) and add a full minimal working example (MWE), that illustrates your problem. – Bobyandbob Sep 22 '18 at 21:35
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    Is there any reason why you need a \parbox for this? – Bernard Sep 22 '18 at 21:43
  • I suppose that the 5.5cm forces the linebreaks.... just increase the width – koleygr Sep 22 '18 at 21:44
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    I'm cleaning what I've written before in course and it was something like that, this was not with a \case and before \parbox was working perfectly but yes idk why i didn't asked myself "why are the 5.5cm here? "... it was late in the evening, thanks @koleygr – Kokodelo Sep 23 '18 at 5:52
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Like everybody else here, I do not know what you're after. Even worse, my crystal ball got stolen, so I have to guess. Most likely this means that I will have to remove this, but I am wondering if you want to achieve something like

enter image description here

\documentclass[fleqn]{article}
\usepackage{mathtools}
\begin{document}
\[
\dots \rightarrow=\begin{dcases}
\{((s_1,s_2),\alpha,(s_1',s_2)) | \alpha \notin H \wedge (s_1,\alpha,s_1') \in \rightarrow 1 \} \cup{}  \\ 
\{((s_1,s_2),\alpha,(s_1,s_2')) | \alpha \notin H \wedge (s_2,\alpha,s_2') \in \rightarrow 2 \} \cup{} \\ 
\{((s_1,s_2),\alpha,(s_1',s_2'))| \alpha \notin H \wedge (s_1,\alpha,s_1') \in
\rightarrow 1 \cap (s_2,\alpha,s_2') \in \rightarrow 2 \}
\end{dcases}
\]
\end{document}

EDIT*: Added {} at the end, big thanks to Bernard!

|improve this answer
  • I guess the first two lines should end with \cup {} for a correct spacing. – Bernard Sep 22 '18 at 22:14
  • @Bernard Thanks! This is really just to find out what the OP wants and will be deleted anyway. – user121799 Sep 22 '18 at 22:17
  • I'm using parbox instead of cases because in my course that i'm cleaning there is not any {. But this is working also. I have marked it as the answer because they were asking me to put a MWE and i guess this is the right format thanks! But now i'm wondering what the \[ (line 3) \] (line 11) are doing in your exemple? – Kokodelo Sep 23 '18 at 5:56
  • @Kokodelo, If your math is not inline (that I suppose it cant be inline -it would be to tall for a line-) then you have to use them inside $$<math here>$$ or \[<math here>\]... with the second being preferred for many years in LaTeX (and not TeX) coding. – koleygr Sep 23 '18 at 9:33
  • @Kokodelo \[...\] is a shortcut for \begin{equation*} ... \end{equation*}\, i.e. an unnumbered equation. You could also do $\displaystyle ...$` if you do not want a line break, but I do not think that will give a good-looking result. – user121799 Sep 23 '18 at 14:01

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