Customizing counters of theorem environments.

[Rudi Gaelzer]

Hi there.
I'm using the module Theorems (AMS, Numbered by Type).
I would like to change the counters of theorem-like environs, adding a fixed string in front 
of the number.  Something like 

Theorem TGA-1
Definition TGA-2
etc

Can I do that the usual way that is done for the standard LaTeX counters?
I mean, in ERT: 
\renewcommand{\theequation}{TGA-\arabic{equation}} 
I that case, I would need to know the names of the counters, but I can't find them.

Or is there another way?
Thanks.
-- 
Rudi Gaelzer
Institute of Physics
Federal University of Rio Grande do Sul
BRAZIL
Registered linux user # 153741
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