| This is a full list of my research articles: 1. Fredholmness and Weylness of block operator matrices (2022) 2. Perturbing the spectrum of operator Tdn(A) (2023) 3. Invertibility properties of operator matrices on Hilbert spaces (2023) 4. Upper triangular operator matrices and stability of their various spectra (2024) 5. Completion problem of upper triangular 3×3 operator matrices on arbitrary Banach spaces (2025) 6. On the fractional relaxation equation with Scarpi derivative (2025) |