Book, Paragraph

 1      I, 5 |           results also by reductio ad impossibile.~It is clear
 2      I, 6 |    possible also without reduction ad impossibile, if one of the
 3      I, 7 |  particular syllogisms by reductio ad impossibile. In the first
 4      I, 7 |       second figure, reducing them ad impossibile, e.g. if A belongs
 5      I, 17|         propositions by a reductio ad absurdum, i.e. by claiming
 6      I, 17|          be obtained by a reductio ad absurdum: for if it is assumed
 7      I, 21|         will proceed by a reductio ad impossibile. Suppose that
 8      I, 23| hypothetical proof is the reductio ad impossibile. Let us speak
 9      I, 23|         will show that reductiones ad also are effected in the
10      I, 23|          established in reductions ad impossibile by an ostensive
11      I, 29|          differs from the reductio ad impossibile in this: in
12      I, 29|         the truth, in the reductio ad impossibile one of the premisses
13     II, 14|           ostensive to reduce them ad impossibile in the terms
14     II, 17|          in the case of a reductio ad impossibile, to rebut the
15     II, 17|          in the case of a reductio ad impossibile, and when the
16     II, 17|            so establish a reductio ad impossibile: for Zeno’s