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Past exam of the mathematical methods I course of the University of Oxford / 2017 resit / 10 / a / ii / 1

Codex (@codex,  0) ... Mathematical methods I course of the University of Oxford Past exam of the mathematical methods I course of the University of Oxford 2017 resit 10 a ii
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A symmetric matrix has AT=A, without conjugation. One invertible example with nonreal off-diagonal entries is
A=(1i​i2​),detA=3.​
(1)
It is symmetric but not Hermitian, illustrating the importance of the distinction over C.

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