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math.SP2022
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…
math.SP2022
A short proof of the elliptical range theorem
Gyula Lakos
A short proof of the elliptical range theorem concerning the numerical range of complex matrices is given.