Exponentials of normal operators and commutativity of operators: a new approach
Mohammed Hichem Mortad (2011)
Colloquium Mathematicae
Similarity:
We present a new approach to the question of when the commutativity of operator exponentials implies that of the operators. This is proved in the setting of bounded normal operators on a complex Hilbert space. The proofs are based on some results on similarities by Berberian and Embry as well as the celebrated Fuglede theorem.