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- Harry A. Mavromatis, Rajai S. Alassar
- Appl. Math. Lett.
- 2001

- E Heinz, H Müther, H A Mavromatis
- 2008

A generalized RPA formalism is presented which treats pp and ph correlations on an equal footing. The effect of these correlations on the single-particle Green function is discussed and it is demonstrated that a self-consistent treatment of the single-particle Green function is required to obtain stable solutions. A simple approximation scheme is presented… (More)

It is proved that quasi-exactly soluble potentials (QESPs) corresponding to an oscil-lator with harmonic, quartic and sextic terms, for which the n + 1 lowest levels of a given parity can be determined exactly, may be approximated by WKB equivalent potentials corresponding to deformed anharmonic oscillators of SU q (1,1) symmetry, which have been used for… (More)

Using standard perturbation theory, simple new double and triple summation expressions are obtained. 1. Introduction. Using standard nondegenerate perturbation theory, if the exact energy of a system is known, we can compare this exact expression to the perturbation expansion of the energy in powers of some small parameter. Equating equal powers of this… (More)

- Hari M. Srivastava, Harry A. Mavromatis, Rajai S. Alassar
- Appl. Math. Lett.
- 2003

Motivated essentially by their possible need in a fairly large number of physical and chemical contexts, Mavromatis and Alsssar [l] derived several associated Laguerre integral results by eliminating au unnecessary constraint used in an earlier paper on the subject by Mavromatis [2]. The main object of the present sequel to these recent works is to… (More)

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