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Hi,

I'm a new user to TeXmacs and I have a problem. I'm typing a document that 
has a lot of vectors which are bold, upright letters. However, in TeXmacs, if 
I use bold in math mode, a single letter is always slanted. For instance if I 
type "a" the "a" is italic and not upright. However, if I type "aa", then 
"aa" is bold, upright. I can see how this could be useful. However, I need to 
enter a bold, upright "a" in math mode. How can I do this?

Thanks,

Robert