Definition talk:Pullback of Quotient Group Isomorphism

Extracted from 'explain':

This seems to me like a very superfluous way of stating 'preimage'. What is the added value of this concept?

Ans: Haven't a clue. Got the concept from the source below but at that stage I was getting out of my depth. Leave it in, though, it probably has subtleties.

This concept is essentially an instance of the identically named construct in category theory, where it plays a profound rôle. I may get there, in a few years or so... --Lord_Farin 16:54, 22 July 2012 (UTC)