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Past exam of the mathematics course of the year 2 of the natural sciences course of the University of Cambridge / 2025 / Paper 2 / 6 / c / i / Solution 2026-10-18
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Relabel the two dummy indices and use the respective symmetries:
Xij​Aij​=Xji​Aji​=−Xij​Aij​=0.
(1)
Thus the symmetric tensor and antisymmetric tensor subspaces are orthogonal in the Frobenius inner product.
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