Let $T$ be some operator in Euclidean or Unitary space.
How can I prove that the operators $TT^*$ and $T^*T$ are self-adjoint and have the same eigenvalues?
Im confused.. Where do I begin?
Is this possible when T is a normal operator?
2026-05-03 15:20:17.1777821617
Self-adjoint operators $TT^*$ and $T^*T$
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