Lifting group homomorphisms. (English) Zbl 0513.57001
MSC:
57M25 | Knots and links in the \(3\)-sphere (MSC2010) |
20F34 | Fundamental groups and their automorphisms (group-theoretic aspects) |
20F14 | Derived series, central series, and generalizations for groups |
20C99 | Representation theory of groups |