 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2026/ii/paper-2/6c/a/solution

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

Conservation requires zero flux:

n_{x} (0, t) = n_{x} (L, t) = 0

. Indeed

d \int_{0}^{L} n, d x / d t = D [n_{x}]_{0}^{L} = 0

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