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I am typing some mathematical expression related to 'displaystyle'. This is working well for $\displaystyle\sum_{i=1}^nx_i=1$. But it is not working in the following example : 

\documentclass[10pt]{article}
\usepackage{amsmath}

\begin{document}
$P \displaystyle\simeq_p Q$
\end{document}

This gives :
enter image description here

But my desired output is :
enter image description here

Anyone can tell me what is the problem here ?

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1 Answer 1

Reset to default
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Only limits on \mathop operators (like \sum) change in dispaystyle. Limits on relational infix operators stay in subscript position.

You could do

$P \displaystyle\mathrel{\mathop{\simeq}_p} Q$

To locally get mathop positioning and then make the construct a relation again.

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    @SoumitraSen thanks (you don't have to accept, but if you want to accept you need to click on the accept button to make the tick mark)
    – David Carlisle
    Commented Apr 12, 2013 at 14:32

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