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Название: Upper Bounds for Density Matrices Using Path Integrals
Автор: Gross E.P.
We discuss upper bounds for density matrices for a particle, that occur in potential theory, and as a result of averaging over other degrees of freedom. The Weiner path integral representation is used. A basic technique of Symanzik is generalized in a variety of ways to a series of sharper upper hounds. There are distinct ways of applying the technique to the two-parameter integrals that describe averaged density matrices.