| | |
| Paragraph 1 |
It is clear then what conversion is, how it is effected in each
figure, and what syllogism results. |
| Paragraph 2 |
All the problems can be proved per impossibile in all the figures,
excepting the universal affirmative, which is proved in the
middle and
third figures, but not in the first. |
| Paragraph 3 |
But the particular affirmative and the universal and particular
negatives can all be proved. |
| Paragraph 4 |
Again suppose that A belongs to some B, and let it have
been assumed
that C belongs to all A. |
| Paragraph 5 |
To prove that A does not belong to all B, we must suppose that it
belongs to all B: |
| Paragraph 6 |
It is clear then that not the contrary but the contradictory ought
to be supposed in all the syllogisms. |
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created 1996/11/25 modified 2009/04/26