2026. Rigorous Spectral Analysis of a Schrödinger Operator with Fractional and Logarithmic Perturbations: Fixed-Point Formulation and Explicit Constants. Sana’a University Journal of Applied Sciences and Technology. 4, 9 (Sep. 2026), 2575–2611. DOI:https://doi.org/10.59628/jast.v4i9.3539.