By Veneziano.

This record goals at explaining why (sections 1-4) we're ended in give some thought to heavily the duality method of powerful interactions, either from analogy with an identical method of the idea of nuclear reactions, and as a potential means out of the disagreeable deadlock into which quantum relativistic theories of robust interactions appear to be pressured. subsequent we will talk about how (sections 5-6) we cross approximately discovering options to the limitations of a twin idea and what their houses are. eventually, a few principles should be awarded bearing on the place (section 7) all this may convey us within the close to destiny.

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1) in order to emphasize their "chemical" significance: Table 1 presents the various distributions of the correlated electrons into these sets, with 'R' standing for Rydberg orbitals or Rydberg states. For the description of the vertical spectrum of it is necessary to account for transitions, so that the MCSCF space has been built as a product of smaller MCSCF spaces as follows: part A : Two electrons in the set describing both the ground state and the excited states using a CAS space, part B : Three electrons in the set and only one in the (n) set describing the excited states using a MCSCF space.

Grigolini, "Quantum Irreversibility and Measurement". University press (1993). Toute tentative de faire rentrer les questions chimiques dans le domaine des doctrines mathématiques doit être réputée jusqu'ici, et sans doute à jamais, profondement irrationnelle, comme étant antipathique à la nature des phénomènes: elle ne pourrait découler que d'hypothèses vagues et radicalement arbitraires sur la constitution intime des corps, ainsi que j'ai eu occasion de l'indiquer dans les prolégomènes de cet ouvrage.

Pernot, Chem. Phys. 90, 271 (1984). 13. Ahlrichs, Phys. Rev. 64 , 2706 (1976) This page intentionally left blank. A Coupled MCSCF-Perturbation Treatment for Electronic Spectra O. PARISEL and Y. S. et Observatoire de Paris, 24 rue Lhomond, F. 75231 Paris Cedex 05, France 1. 1. PURE VARIATION OR PERTURBATION APPROACHES Despite continuous efforts over many decades, the determination of accurate wavefunctions and energies for polyatomic systems remains a challenging problem. Although carefullydesigned implementations of various codes and computational developments allow now for calculations that were unrealistic even a few years ago, the evaluation of correlation energies and highly-correlated wavefunctions, that are necessary to properly describe excited states or potential energy surfaces, remains still in most cases a tremendous task which can hardly be performed routinely and rigorously for large systems.

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