For both, comparing your final algebraic form with known results from literature (e.g., a published review article on phonons) is fair game—it’s research, not copying.
If you cannot obtain the official manual, here are three superior strategies: Solid State Physics Ibach Luth Solution Manual
is the inclusion of "Panels"—separate sections that explain experimental methods and real-world research, making the theoretical problems more grounded. Ideal for Engineers For both, comparing your final algebraic form with
Praised for its concise, modern approach and its seamless bridge between fundamental quantum mechanics and real-world material properties, this text is a staple in university courses worldwide. However, one question echoes through university corridors and physics forums: Where can I find the official Solution Manual for Ibach & Lüth? Google Books Why This Text Stands Out
Solid State Physics Harald Ibach Hans Lüth is a staple in materials science, famously bridging the gap between abstract theory and experimental reality. While a full, official "Solution Manual" is often restricted to instructors, the textbook itself includes an extensive series of problems at the end of each chapter designed to consolidate the material. Google Books Why This Text Stands Out