Alberto Meroni wrote:
> 
> I have the following behavior which is not normal according to me
> with lyx version 15fix1 but also 12 (the machine is a Linux debian potato).
> I have a matrix in math displaystyle and one of the cell is a frac
> which I would like to have in displaystyle. If I export the file in TeX
> and add a {\displaystyle } everything is ok but if I select the
> frac or put the cursor before the frac and do a math-size displaystyle
> in the minibuffer I have no effect (in the ps view of course).
> What I have misunderstood ?

do a 

\newcommand\myDStyle[1]{\displaystyle{#1}}

in latex preamble and than in your formular \myDStyle{

lyx puts the closing paranthesis my itself. now you can insert your 
fraction and it never gets lost.

Herbert


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