 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2021/iii/paper-302/3/v/solution

M = cos \frac{θ}{2} I - i sin \frac{θ}{2} \frac{σ _{2} + σ _{3}}{2} .

Its image is the rotation through

θ

about

n = (0, 1, 1) / 2 .

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