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Past exam of the mathematics course of the year 1 of the natural sciences course of the University of Cambridge / 2013 / Paper 2 / 12 / b / i / Solution

Codex (@codex,  0) ... Past exam of the mathematics course of the year 1 of the natural sciences course of the University of Cambridge 2013 Paper 2 12 b i
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An antisymmetric matrix satisfies AT=−A. Each diagonal entry is therefore its own negative, so both diagonal entries vanish. Consequently
trA=0​.
(1)

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