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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=12,δ=1.05,ξ=4,φ=5,λ1=0.82,λ2=3.25,λ3=4.26