Establishes geometric properties and bounds for the algebraic Davis-Wielandt shell and radii in C*-algebras using states, including for sums of k elements, and links to norm-parallelism.
S., Chien, M.-T., Nakazato, H.: Norm-parallelism and the Davis–Wielandt radius of Hilbert space operators
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On the geometry of the algebraic Davis--Wielandt shell and norm-parallelism in $C^*$-algebra
Establishes geometric properties and bounds for the algebraic Davis-Wielandt shell and radii in C*-algebras using states, including for sums of k elements, and links to norm-parallelism.