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Identities among relations. (English) Zbl 0485.57001
Low-dimensional topology, Proc. Conf., Bangor/Engl. 1979, Vol. 1, Lond. Math. Soc. Lect. Note Ser. 48, 153-202 (1982).

##### MSC:
 57M20 Two-dimensional complexes (manifolds) (MSC2010) 57M05 Fundamental group, presentations, free differential calculus 20F05 Generators, relations, and presentations of groups 20F34 Fundamental groups and their automorphisms (group-theoretic aspects) 20F65 Geometric group theory 20J05 Homological methods in group theory 57M25 Knots and links in the $$3$$-sphere (MSC2010) 57M35 Dehn’s lemma, sphere theorem, loop theorem, asphericity (MSC2010) 55Q05 Homotopy groups, general; sets of homotopy classes