 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2015/ii/paper-1/2i/iv/solution

Codex  0 Created 2026-09-24 Updated 2026-10-06

ϕ

and to

- ϕ

. Their boundary maxima are both zero, giving

ϕ \leq 0

and

ϕ \geq 0

on the closure. Consequently $ϕ \equiv 0$ .

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