Book, Paragraph

 1      I, 6 |         is possible also without reduction ad impossibile, if one of
 2      I, 11|  necessary. The proof of this by reduction will be the same as before;
 3      I, 29|         ostensive syllogism or a reduction to impossibility. For both
 4      I, 29|      sequel, when we discuss the reduction to impossibility: at present
 5      I, 29|         ostensive syllogism or a reduction to impossibility. In the
 6      I, 44|         analysed either; but the reduction to what is impossible can
 7      I, 45|      concerns the major extreme, reduction to the first figure will
 8      I, 45|     these alone are confirmed by reduction to what is impossible.~It
 9     II, 11| premisses have been taken, but a reduction to the impossible takes
10     II, 11|     conversion admit also of the reduction per impossibile.~All the
11     II, 14|      what it wishes to refute by reduction to a statement admitted
12     II, 17|          was being proved by the reduction. For unless a man has contradicted
13     II, 25|                            25~By reduction we mean an argument in which
14     II, 25|      probable than AC, we have a reduction: for we are nearer to knowledge,
15     II, 25|          few, I do not call this reduction: nor again when the statement