Titlebook: Oscillator Representation in Quantum Physics; M. Dineykhan,G. V. Efimov,S. N. Nedelko Book 1995 Springer-Verlag Berlin Heidelberg 1995 Pha

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0940-7677 tonian or potential. However, the exact solutions are known for rather a restricted set of potentials, so that the standard eternal problem that faces us is to find the best effective approximation to the exact solution of the Schrodinger equation under consideration. In the most general form, this

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The Character of the Phase Transition in Two- and Three-Dimensional , Theoryis given in part I. However, the functional representation has the advantage of calculating the whole effective potential (EP) in this theory, which allows one to get more information about the phase structure and phase transitions in the system under consideration.

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The Phase Structure of the (,), Field Theory in al approach [19, 23, 18]. It was also studied by using the renormalization group technique [29] and by the OR method [32]. It should be noted that the variational approach is well-defined in this case, since only normally ordered divergences are present in the two-dimensional scalar theory.

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Wave Propagation in Randomly Distributed Mediaatmosphere or water [119]. A series of different methods has been applied to this problem, among which path integral techniques [120, 121, 122] are of considerable interest. In this chapter we investigate wave transmission in a randomly distributed medium using the GER method.