By Kevin L Flannery S J

Methods into the common sense of Alexander of Aphrodisias is meant to offer an outline of the good judgment of Alexander of Aphrodisias (fl. early third century A.D.). considering the fact that a lot of what may be referred to as Alexander's good judgment is just Aristotelian common sense, rather than accomplishing point-by-point research, it takes up 3 topics, one from all the major parts of conventional good judgment: the assertoric syllogistic, the modal syllogistic, and the world of metalogical issues. It presents perception not just into Aristotle's logical writings themselves but additionally into the culture of scholarship which they spawned: the guidelines and analyses of such figures as Theophrastus of Eresus, John Philoponus and (more lately) Jan Lukasiewicz.

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Ways into the Logic of Alexander of Aphrodisias

Methods into the common sense of Alexander of Aphrodisias is meant to offer an outline of the good judgment of Alexander of Aphrodisias (fl. early third century A. D. ). seeing that a lot of what may be known as Alexander's good judgment is just Aristotelian common sense, rather than accomplishing point-by-point research, it takes up 3 topics, one from all the major parts of conventional good judgment: the assertoric syllogistic, the modal syllogistic, and the world of metalogical issues.

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317; Mignucci (1969), p. 260-2. 60 To justifY these proofs, however, in an absolutely rigorous fashion, we need (I) to add to {L2} the relevant negative clauses. ' We would also need (2) to justifY a special rule which would allow one to go from an e-proposition containing as subject a tied term (see above, note 37) to the corresponding a-proposition containing as subject the term to which the one term is tied. ' I discuss this move below. 7-16 respectively. 12: Et yap 'tip r ltUV'tt el; ECTHESIS 25 2 (5) yiB 4 a-conversion 2,3 (6) AoB 3,5 Feria 2 (7) AoB 1,3,6 EE There is an exceptional and important feature of these proofs of which we must now take note.

The first of these difficulties is resolved when we realize that Alexander has not presented the steps of his reasoning in their logical order. In particular, (9) is out of place. Alexander's task, as I said, is to reverse the positions of the terms of BiA. He must there28 The symbol a here replaces the r of the text. This makes it more clear that the ectethen is ·d 'tou A. 29 I shall argue below that in Alexander this situation warrants the assertion of the corresponding i-proposition: AiB. 12 CHAPTER ONE fore begin with B on the left side: this is the position in which it (or any term) stands when it is predicated JCa'ta 7tav'to~, as in (9).

1Ep£t auto\\. It would of course be possible to provide a more rigorous justification of this move, employing rules (et), (ke) and (uk). But again we find Alexander casually presupposing all this in the syllogistic itself. 43a25-29. 64 See pp. 15 and 19. " 65 Whereas the definitional proof brings in the dictum de omni et nullo as a semantical basis for the syllogistic, the perceptual proof shows no such concern. Is this an implicit acknowledgement on Alexander's part that the perceptual proof is less rigorous than the definitional?

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