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Exact analytical representations for Appell's series F2(x, y) to the vicinity of the singular point (1, 1) and near the boundary of its domain of convergence are given. It is shown that Appell's functions F2(1, 1) and F3(1, 1) have the property of mirror-like symmetry with respect to the center j0 ↦ -(1/2) under the change j ↦ -j-1, z∈ℤ, and they correlate between each other.
An overview over the field of few-nucleon systems is presented. Special emphasis is laid on the construction of a unified approach to hadronic and electromagnetic reactions on few-nucleon systems, necessary for studying the borderline between quark-gluon and effective descriptions. We briefly outline the Lorentz integral transform (LIT) method which offers a unique possibility to tackle this ambitious task.