Arvind Thomas has written a remarkable book. That said, however, it must be quickly added that it is not a book for everyone, not even for all students of medieval literature. It is a very thoughtf...

In this article we show that it is possible to completely classify the degrees of r.e. bases of r.e. vector spaces in terms of weak truth table degrees. The ideas extend to classify the degrees of complements and splittings. Several ramifications of the classification are discussed, together with an analysis of the structure of the degrees of pairs of r.e. summands of r.e. spaces.

Many structures in nature are invariant under the transformation pair, (p,r)→(b r,−p/b), where b is some scale factor. Born’s reciprocity hypothesis affirms that this invariance extends to the entire Hamiltonian and equations of motion. We investigate this idea for atomic physics and galactic motion, where one is basically dealing with a 1/r potential and the observations are very accurate, so as to determine the scale b≡mΩ. We find that an Ω∼1.5×10−15 s−1 has essentially no effect on atomic physics but might (...) possibly offer an explanation for galactic rotation, without invoking dark matter. (shrink)

“To whom is the Consecration of Medal, Stature or even Pyramid more jusly due, than to … the late Illustraious Boyle? … for the happy Improvement of Otto Guericks Magdeburg Exhausterm and for his Profound and Noble Researches into all the abstruser Parts and Recesses of the most useful Philosophy … I have named the Illustrious Boyle, and fix his Trophy here.”John Evelyn, Numismata, 1697.

This paper thematizes the crucial agreement and point of departure between Jacobi and Fichte at the height of the “atheism controversy.” The argument on the proper relationship between philosophy and existence or speculation and life had far-reaching consequences in the history of thought after Jacobi and Fichte in German Idealism on the one hand, primarly advocated by Schelling and Hegel, and on the other hand by existentialism and vitalism. The essay focuses first on Jacobi’s philosophy of life, which centrally influenced (...) and attracted Fichte to Jacobi. Jacobi’s dualism between speculation, of which he was skeptical, and life, became Fichte’s dualism. Fichte’s transcendentalism, however, prioritized, contrary to Jacobi, both speculation and systematicity. Both of these elements became central for later forms of German Idealism. In the last part of the essay Hegel’s absolute idealism becomes the platform affording a critical perspective on Fichte’s transcendental philosophy. (shrink)

Este artigo recorda os principais aspectos e motivações da Expedição Langsdorff, missão de reconhecimento do interior do Brasil iniciada em 1821, composta pelo cônsul russo barão Langsdorff, o pintor alemão Moritz Rugendas, Aimé-Adrien Taunay, Nicolas-Antoine Taunay, o polígrafo Hercules Florence e o especialista em mapas Néster G. Rubtsov. Busca diferenças entre esta expedição e iniciativas outras, a título de exemplo, as dos bandeirantes e jesuítas, bem como a expedição indigenista de Rondon, e propõe o aprofundamento das investiga­ções. Apresenta atributos resgatados (...) pela poesia brasileira contemporânea e elementos cons­titutivos da identidade cultural brasileira presentes na Expedição Langsdorff, os quais os auto­res sugerem ser relevantes para pesquisadores do tema e para a inserção do Brasil no contexto internacional político, diplomático e econômico nos tempos hodiernos. (shrink)