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Hi Stefan_K,

Many thanks for answering my question...

I don't use the special packages like beamer or powerdor, I use the normal one 'lecture' (I think it is very standard package in Latex!)

There was no error message but there is also no effect to the slides, e.g., it does not change the color ...

Hi Stefan_K,

I would like to change globally equation color of the whole slides and I did exactly what you recommended but it did not work:

\everymath{\color{blue}}

\everydisplay{\color{blue}}

As I used latex for the slides for presentation so I'm not sure if it works for slides? Or it just ...