Philoponus: On Aristotle's Prior Analytics

f. 67v. p. 12,5—11. ...
p. 20,5—11. ... 5. 6 "if—is found": some say that the definition of affirmation alone is found. 7 "we shall say": but we say. 9 "of this": it is clear that.

f. 68r. p. 21,27—29. For the demonstrative [syllogism] takes only what seems true to him, but the dialectical [syllogism] takes those things which seem [true]—[even if they are] false.

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p. 42,4—19. That converting propositions, if they have the same order of terms but not the same quality, is called "contingent conversion," because in the matter of the contingent alone [e.g.] "some man is not a man" is not [the case]; both are true. But if both the order of terms and the quality are different, it is called "conversion with opposition." If "every man is an animal," [then] "that which is not an animal is not a man." But if the quality of the propositions is the same and the order is different, it is called "simple conversion." "Every man is an animal." "Some animal is a man." Simple conversion, therefore, is the communion of two propositions regarding both terms, while the quality remains the same and the proposition is exchanged with mutual truth.

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