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math.SP2026
The elliptical range theorem for the conformal range
Gyula Lakos
The conformal range (or the real Davis--Wielandt shell), which is a particular planar projection of the Davis--Wielandt shell, can be considered as the hyperbolic version of the nu…
math.SP2026
On the elliptical range theorems for the Davis-Wielandt shell, the numerical range, and the conformal range
Gyula Lakos
We consider the elliptical range theorems for the Davis--Wielandt shell, the numerical range, and the conformal range in terms of and related to their quadratic representations. Th…