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References to 'abelianization'
1. Algebraic K-theory by mhale
2. derived subgroup by yark
3. free group by yark
4. homology of $\mathbb{RP}^3$. by mathcam
5. homology of the sphere by mathcam
6. Lie algebra cohomology by rmilson
7. perfect group by bwebste
8. Poincar\'e dodecahedral space by Mathprof
9. reflective subcategory by CWoo
10. transfinite derived series by yark