Question #106058
Consider linear operator T:C^3-->C^3 def by T(z1,z2,z3)=(z1+iz2, iz1-2z2, -iz2+z3). Check T* and check if T is self adjoined. check if T is unitary
1
Expert's answer
2020-03-23T10:14:56-0400

Here matrix representation of T with respect to standard basis {(1,0,0),(0,1,0),(0,0,1)}\{ (1,0,0), (0,1,0), (0,0,1)\} over the field CC is A=A=

(1i0i200i1)\begin{pmatrix} 1& i& 0 \\ i & -2&0\\ 0&-i&1 \end{pmatrix}

Now , T=T^*= Transpose conjugate of matrix representation of TT

=AH=A^H

== (1i0i200i1)\begin{pmatrix} 1&-i&0 \\ -i&-2&0\\ 0&i&1 \end{pmatrix}

Since ,AAHA\neq A^H

Hence, TT is not a self adjoint operator.

To check unitary operators ,

Consider A.AH=A.A^H= (23i13i52i12i2)\begin{pmatrix} 2&-3i&-1\\ 3i&5&-2i\\ -1&2i&2 \end{pmatrix} I\neq I

Where II stands for identity matrix.

Therefore,TT is not a unitary operator.



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