Book, Paragraph

 1      I, 23| impossibile. Let us speak first of ostensive syllogisms: for after these
 2      I, 23|          It is clear then that the ostensive syllogisms are effected
 3      I, 23|    reductions ad impossibile by an ostensive syllogism, and the original
 4      I, 23|           have already stated that ostensive syllogisms are effected
 5      I, 29|         conclusions are similar to ostensive syllogisms; they also are
 6      I, 29|       whether one wishes to use an ostensive syllogism or a reduction
 7      I, 29|           it has been proved by an ostensive syllogism that A belongs
 8      I, 29|          is, the syllogism will be ostensive by means of the same terms.
 9      I, 29|            the same terms. For the ostensive syllogism differs from the
10      I, 29|        impossibile in this: in the ostensive syllogism both remisses
11      I, 29|          whether we wish to use an ostensive syllogism or a reduction
12     II, 14|           impossibile differs from ostensive proof in that it posits
13     II, 14|      admitted to be false; whereas ostensive proof starts from admitted
14     II, 14|            conclusion. Also in the ostensive proof it is not necessary
15     II, 14|     possible if the syllogisms are ostensive to reduce them ad impossibile
16     II, 14|           of the conclusion of the ostensive syllogism is taken as a
17     II, 17|          formula in the case of an ostensive proof; for here what one
18     II, 17|            that is not possible in ostensive proofs: since if an assumption