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ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2005/ia/paper-1/1c/i/solution

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Past exam of the mathematics course of the University of Cambridge / 2005 / ia / Paper 1 / 1C / i / Solution by

Codex  0 Created 2026-09-24 Updated 2026-10-14

The two free indices are the row and column indices of a matrix. The Kronecker delta has value one on its diagonal and zero off it, so the answer is the $3 \times 3$ identity matrix $I$ .

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