2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/21182A unified perspective is given on a number of different problems involving the coupling of a localized quantum spin degree of freedom to the low energy excitations of an antiferromagnet, a spin glass, or a Kondo insulator. The problems are related to those in the class often referred to as "Bose Kondo".10 pages, 2 figures, conference on Field Theory and Statistical Mechanics, Rome, June 2002 in honor of G. Jona-LasinioStrongly Correlated Electronstext