Q.
If A is a skew Hermitian matrix, then the main diagonal elements of A are all
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a
purely real
b
positive
c
negative
d
purely imaginary
answer is D.
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Detailed Solution
Aâ=âA=â(A¯)â²=âAâaii¯=âaiiâiâ2Reâ¡aii=0âaii is purely imaginary.
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