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Jul 28, 2015 at 16:59 comment added Cusp @Seirios see math.stackexchange.com/questions/751823/… for an explanation.
Jul 28, 2015 at 12:38 comment added Seirios Maybe I am missing something, but I find the first assertion of the second paragraph suspicious. I cannot insert a picture in a comment, but the word $b_1^2a_1b_1^{-1}b_2^{-1}$ in $$\langle a_1,a_2,b_1,b_2 \mid [a_1,b_1][a_2,b_2]=1 \rangle$$ seems to be representable as a non singular loop whereas it is neither a standard generator nor a product of commutators of standard generators.
S Jul 25, 2015 at 13:23 history answered Cusp CC BY-SA 3.0
S Jul 25, 2015 at 13:23 history made wiki Post Made Community Wiki by Cusp