Book, Paragraph

 1      I, 7 | brought to a conclusion either ostensively or per impossibile. In both
 2      I, 7 |       if they are made perfect ostensively, because (as we saw) all
 3      I, 23|       part, and further either ostensively or hypothetically. One sort
 4      I, 29|   involved. For what is proved ostensively may also be concluded syllogistically
 5      I, 29| impossibile may also be proved ostensively, e.g. that A belongs to
 6     II, 14|  Everything which is concluded ostensively can be proved per impossibile,
 7     II, 14|      impossibile can be proved ostensively, through the same terms.
 8     II, 14|     prove each of the problems ostensively as well. Similarly it will
 9     II, 14|       i.e. per impossibile and ostensively, and it is not possible
10     II, 17|       when anything is refuted ostensively by the terms ABC, it cannot