Book, Paragraph

 1      I, 1 |        one of two contradictory statements (the demonstrator does not
 2      I, 3 |       is possible), affirmative statements will all convert in a manner
 3      I, 3 |         proved. But in negative statements the case is different. Whatever
 4      I, 3 |  conversion like other negative statements, e.g. if one should say,
 5      I, 3 |    converts like other negative statements. For if it is possible for
 6      I, 5 |        by certain supplementary statements, which either are contained
 7      I, 26|         figures. But particular statements can be refuted in one way
 8      I, 26|         to none. But particular statements are easier to establish:
 9      I, 26|        it is possible to refute statements by means of one another,
10      I, 26|      another, I mean, universal statements by means of particular,
11      I, 26|      particular, and particular statements by means of universal: but
12      I, 26| possible to establish universal statements by means of particular,
13      I, 26|         to establish particular statements by means of universal. At
14      I, 28|    other. Perhaps each of these statements will become clearer in the
15      I, 30|       the three terms, refuting statements in one way, confirming them
16      I, 39|       meant is the same in both statements), it is better to take as
17      I, 46|           The relation of these statements to one another is as follows.
18     II, 4 |        same applies to negative statements.~It is clear then that if
19     II, 7 |     universal is proved through statements which are universal, but
20     II, 11|      other of two contradictory statements holds good, then if it is
21     II, 15|      oppositions to affirmative statements, it follows that opposite
22     II, 15|        it follows that opposite statements may be assumed as premisses