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compact perturbations 1essential spectrum 1moore-penrose inverse 1operator factorization 1partial isometries 1Schatten class 1

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1 paper

math.FA2026

Spectral Characterizations of Schatten-class perturbations of Partial isometries

Neeru Bala, Ramesh Golla

The paper provides criteria for when a bounded operator is a compact or Schatten‑class perturbation of a scalar multiple of a partial isometry with finite‑dimensional kernel, using…