Abstract
Every compact quasinilpotent Hilbert space operator can be uniformly approximated by operators that are similar to the Volterra operator in L2([0,1],dx).
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References
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Herrero, D.A. The Volterra operator is a compact universal quasinilpotent. Integr equ oper theory 1, 580–588 (1978). https://doi.org/10.1007/BF01682942
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DOI: https://doi.org/10.1007/BF01682942