Hi,

I got a problem with integral operators. Looking at the Math help Chap 10, it 
says that in order to use integral operators one must have the option Use 
esint package automatically set in the documents settings. I have this option 
set, but for some reason when I am going to view my file in pdf, Lyx says the 
following:

$\intop
            $
I wasn't able to read the size data for this font,
so I will ignore the font specification.
[Wizards can fix TFM files using TFtoPL/PLtoTF.]
You might try inserting a different font spec;
e.g., type `I\font<same font id>=<substitute font name>'.

I don't know what it means. How can I solve this problem?

thanks for your help.

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