Old solution (bad): "By the isomorphism theorem, G/N ≅ H, so done."
Understanding ideals, quotients, and localization. lang undergraduate algebra solutions upd
Finding reliable can be a challenge because Serge Lang’s textbooks are known for their "dry" style and high-level abstraction. Unlike many modern texts, Lang often leaves significant "details for the reader," making a good solutions guide essential for self-study. Old solution (bad): "By the isomorphism theorem, G/N