2

I want to remove the margin above \bigcup symbol :

enter image description here

\begin{displaymath}
\prod_{i\in I} X_i \bydef \left\{\left. x\in\left( \bigcup_{i\in I} X_i \right)^I \right\vert  \: \forall i\in I, x(i)\in X_i \right\}
\end{displaymath}

I don't know how to proceed ? Thank for help :)

  • there is no margin, it is just that the () are vertically centred on the math axis. use \bigl( not \left(, – David Carlisle Mar 12 '17 at 18:17
  • It doesn't change anything :( – Phoenix Mar 12 '17 at 18:21
  • welcome to TeX.SE! please, provide code for your equation, the best as small, complete document. – Zarko Mar 12 '17 at 18:22
  • @Phoenix yes it would, see the posted answers. – David Carlisle Mar 12 '17 at 20:02
5

I wouldn't autosize any of the "fence" symbols. Instead, I'd use \Big and \bigg sizing directives. Observe that TeX automatically (and correctly) inserts some whitespace around \biggm\vert; this doesn't happen if one writes \middle\vert (or \right\vert).

enter image description here

\documentclass{article}
\begin{document}
\[
\prod_{i\in I} X_i = \biggl\{ x\in\Bigl(\bigcup_{i\in I} X_i \Bigr)^{\!I} 
    \biggm\vert  \forall i\in I, x(i)\in X_i \biggr\}
\]
\end{document} 
| improve this answer | |
4

is this better?

enter image description here

considering David Carlisle comment you can rewrite your equation into:

\[
\prod_{i\in I} X_i = \left\{ x\in\biggl(\ \bigcup_{i\in I} X_i \biggr)^I \middle\vert  \: \forall i\in I, x(i)\in X_i \right\}
\]
| improve this answer | |
  • There is some margin as \bigcup_{i\in I}^{ "something" } :/ – Phoenix Mar 12 '17 at 18:38
  • 1
    ups, I don't know :-(. I overlooked this nonses in OP code. corrected. – Zarko Mar 12 '17 at 18:38

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