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Opposition, Obversion, and Duality
1993Squares of opposition have a long history: they were employed from the early middle ages onwards as a simple diagrammatic codification of the logical relationships among the four kinds of categorical propositions, but they apply to modal logics, deontic logics and many others. The purpose of this short paper is to demonstrate that squares of opposition
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VASSILIEV INVARIANTS ON FIBERED AND MUTUALLY OBVERSE KNOTS
Journal of Knot Theory and Its Ramifications, 1999We use the new approach of braiding sequences and the Stanford construction to prove that there is no way to extract information on fiberedness from Vassiliev invariants and that the chirality sensitivity of Vassiliev invariants depends mainly only on the parity of their degree.
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On Consequences By Virtue of Subalternation and Obversion
199256. If the universal affirmative simple is true the particular affirmative simple must be true with it in the same mode. For example, if a‘Ever a is b’ is true in a certain mode,a then it follows that’ some a is b’ will be true in the same mode. For since the sentence is affirmed of all a, it will be affirmed, according to the preceding,b of the ...
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