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一类无界算子的二次数值域和谱
邱汶汶,齐雅茹
The Quadratic Numerical Range and the Spectrum of Some Unbounded Block Operator Matrices
Wenwen Qiu,Yaru Qi
图 6
k
=
1
2
,
δ
=
1.05
,
ξ
=
4
,
φ
=
5
,
λ
1
=
0.82
,
λ
2
=
3.25
,
λ
3
=
4.26