I'm trying to use two different fonts in math mode. Concretely, I would like to use uppercase letters of font Palatino to give names to matrices, leaving the rest in Computer modern, so that matrices have their own style. Is it possible?
It's not quite good an idea: Palatino and Computer Modern don't mix at all visually and it would be very hard for the reader to discriminate between an "A" in CM and an "A" in Palatino.
In my opinion there aren't sufficient visual clues to distinguish the two fonts.
Here are the necessary macros, anyway:
After giving these in the preamble, you can use
\mathpal (or the name you choose) to access letters in Palatino.