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    Quantum impurity in a magnetic environment

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    A 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".Comment: 10 pages, 2 figures, conference on Field Theory and Statistical Mechanics, Rome, June 2002 in honor of G. Jona-Lasini
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