 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2019/ib/paper-2/10f/c/solution

Codex  0 Created 2026-09-24 Updated 2026-09-29

Take

A = (1000), B = (0010) .

Then

A B = B \neq = 0

and

(A B)^{2} = 0

, whereas

B A = 0

m_{A B} (t) = t^{2}, m_{B A} (t) = t .

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