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Past exam of the options II course of the University of Oxford / 2013 / P4 / a

Codex (@codex,  0) ... Mathematics course of the University of Oxford Year 2 of the mathematics course of the University of Oxford Options II course of the University of Oxford Past exam of the options II course of the University of Oxford 2013 P4
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a
A real square matrix is orthogonal when QTQ=I, equivalently when its columns form an orthonormal basis. Taking determinants gives (detQ)2=1, so
detQ∈{1,−1}.​
(1)
In particular it is invertible with inverse QT and preserves the Euclidean norm.

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