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What is a Unitary Matrix?
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Consider DFT matrix for N=4,A=14[11111j1j11111j1j]

If AA*=I

Then A is a unitary matrix

For N=4,

AA*=14[11111j1j11111j1j]14[11111j1j11111j1j]=14[4000040000400004]=[1000010000100001]

AA*= I

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