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Continue to Chatϵ-Condition Pseudospectra of the Direct Sum Operators - https://avesis.ktu.edu.tr/publication/details/023a8e18-ccae-42cb-8990-caacb316104d/condition-pseudospectra-of-the-direct-sum-operators
ϵ-Condition Pseudospectra of the Direct Sum Operators - https://avesis.ktu.edu.tr/publication/details/023a8e18-ccae-42cb-8990-caacb316104d/condition-pseudospectra-of-the-direct-sum-operators