2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/137064Some basic facts about Fredholm indices are briefly reviewed, often used in connection with Toeplitz and pseudodifferential operators, and which may be relevant for operators associated to fractals.5 pages, latex-2e. A few additions and adjustmentsClassical Analysis and ODEsA few remarks about operator theory, topology, and analysis on metric spacestext