Normal operator Guide, Meaning , Facts, Information and Description

In functional analysis, a normal operator on a Hilbert space H is a continuous linear operator N : H → H that commutes with its hermitian adjoint N^*:

N N^* = N^* N.

The main importance of this concept is that the spectral theorem applies to normal operators.

Examples of normal operators:

• Unitary operators (N^* = N ⁻¹)
• Hermitian operators (N^* = N)
• Normal matrices can be seen as normal operators if one takes the Hilbert space to be Cⁿ.

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