When reading a solution, look for the specific definition or theorem that unlocked the proof.
Use solutions to verify your logic, not just the final answer. In abstract algebra, the proof is the answer. lang undergraduate algebra solutions upd
Hints are minimalist, requiring deep reflection on the chapter's core definitions. When reading a solution, look for the specific
Old solution (bad): "By the isomorphism theorem, G/N ≅ H, so done." When reading a solution
Lang often writes "it is trivial to see..." in his proofs. A good solution manual won't just give you the answer; it will show you the intermediate steps you might have missed.