 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2021/ii/paper-2/35b/a/solution

Codex  0 Created 2026-09-24 Updated 2026-09-25

E_{n} (λ) = E_{n} + λ ⟨ n ∣Δ H ∣ n ⟩ + λ^{2} m \neq = n \sum \frac{∣ ⟨ m ∣Δ H ∣ n ⟩ ∣ ^{2}}{E _{n} - E _{m}} + O (λ^{3}) .

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