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Dec 7, 2011 at 15:43 comment added Joël By $a$ I meant the morphism of groups from $F$ to $\mathbb{Z}$ that sends each generator to $1$. I just called it 'augmentation' with quotation marks, because it was a 'kind of' augmentation morphism. Sorry for the ambiguity and confusion. Your references seem interesting for me nevertheless. Thanks for them.
Dec 7, 2011 at 4:55 history edited Cam McLeman CC BY-SA 3.0
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Dec 7, 2011 at 4:28 history answered Cam McLeman CC BY-SA 3.0