In the mathematical computation of many physical problems we have to work with the numerical solution of non-linear problems. Even in case that a direct solution does in principle exist, its feasibility is however actually restricted to a very limited number of instances. Therefore, in this study we will disregard this possibility. Consequently, we

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The discovery in the COBE all-sky maps of a bright isotropic background in the far-IR/sub-mm, of likely extragalactic origin (CIRB), with a proeminent hump at a wavelength of 140 μm, has been interpreted at first as the integrated emission by dust present in very distant galaxies (Puget et al. 1996; Hauser et al. 1998). What is the relation between

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