: Only after exhausting these models do they introduce crystal structures, motivating the reader to understand why a periodic potential is the only way to explain things like insulators or the Hall effect. 2. Core Scientific Contributions
: They introduce quantum mechanics to fix the Drude model, then show that even this isn't enough. Ashcroft and Mermin
David Mermin is known for his unique writing style—subtle, elegant, and occasionally humorous. This makes the book "extraordinarily readable" for a graduate text. : Only after exhausting these models do they