Contributed articles presented at a National Seminar on "Teaching Philosophy in India: a Vision for the Twenty-First Century Education", held at Andhra University, during 9-11 March 1998 and sponsered by Indian Council of Philosophical Research, New Delhi.

It is demonstrated that efficient technical policy must be based on the necessity of natural ecosystems stability. Specific mechanisms, maintaining ecosystems stability are disclosed in this work-prevalence of synthesis processes over degradation and destruction ones; presence of ensuring and duplicating mechanisms; variability of species; a biosphere hierarchy. It is proved the necessity of transition from anthropocentrism towards biocentrism to prevent the ecological catastrophe threat.

In its original form Dirac's equations have been expressed by use of the γ-matrices γμ, μ=0, 1, 2, 3. They are elements of the matrix algebra M 4 (ℂ). As emphasized by Hestenes several times, the γ-matrices are merely a (faithful) matrix representation of an orthonormal basis of the orthogonal spaceℝ 1,3, generating the real Clifford algebra Cl 1,3 . This orthonormal basis is also denoted by γμ, μ=0, 1, 2, 3. The use of the matrix algebra M 4 (ℂ) (...) to represent Cl 1,3 has some unsatisfactory aspects. The γ-matrices contain imaginary numbers as entries whereas Cl 1,3 is real. Moreover, as a matrix algebra Cl 1,3 is M 2 (ℍ) but only a part of M 4 (ℂ). For that reason we investigate in this paper several forms of Dirac's equations in terms of M 2 (ℍ) instead of M 4 (ℂ). In Section1 we survey Dirac's equations describing the interaction of matter with electromagnetic, electroweak, and strong fields. Section2 deals with electromagnetic/weak interactions employing M 2 (ℍ). Finally, in Section3 we deal with Dirac's equations for strong interactions between quarks. In contrast to su(2) ⊕ u(1), the Lie algebra su(3) is not isomorphic to any subalgebra of Cl 1,3 . Therefore we do not give a description of strong interactions by use of M 2 (ℍ). Instead of such an approach we describe these interactions using the space of quadruples of bivector fields in Cl 1,3 . The thus obtained description has remarkable formal resemblance to the original Dirac equations using wave functions with values in the linear spaceℂ 4. (shrink)

The term filiaster , though quite unknown in classical Latin literature, occurs with reasonable frequency in epitaphs from the 2nd century A.D. onwards. It is generally defined as the every-day equivalent of privignus/-a , and it is this Vulgar word which comes down into the Romance languages.

The modal interpretation of quantum theory ascribes at each instant physical magnitudes with definite values to quantum systems. Starting from certain natural requirements, I determine unique solutions for the evolution of these possessed magnitudes in free systems and in special cases of interacting systems. The evolution is given in terms of transition probabilities that relate the values of the possessed magnitudes at one instant to the values at a second instant. I also determine a joint property ascription to a composite (...) system and its separate subsystems. Finally, I give a proof that the predictions of the modal interpretation with respect to measurement outcomes agree with the predictions of the standard interpretation. (shrink)

Considerations about the evolution of the concept of "friendship", just as Cicero understands it, along the history (individual, social, political and religious friendship). Repetitions and interpretations of his definition and of other ciceronian texts. His influence on several authors (such as Augustinus, Isidorus Hispalensis, Rabanus Maurus, Petrus Venerabilis) and, above all, on the mediaeval treaties De amicitia written by Aelredus Rievallensis and Petrus Blessensis.