format of chapter numbers

[Ramon Diaz-Uriarte]

Hi,

I'd like to change the format of the chapter, section, etc numbers, and use a
letter instead of a number. I've tried
\setcounter{chapter}{A}
with no success (It just prints an A, right there, which I don't want, but
nothing else seems to happen --e.g., my equations are still numbered using
numbers, not A.#).

Is there some option in Lyx to do this? I've been looking around the manuals
and can't find anything.

I am using Lyx 1.1.3.

Thanks,

Ramon