Customizing counters of theorem environments.

Rudi Gaelzer rgaelzer at
Tue Jul 20 22:29:27 UTC 2021

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

Can I do that the usual way that is done for the standard LaTeX counters?
I mean, in ERT: 
I that case, I would need to know the names of the counters, but I can't find them.

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