Deductive Logic

by St. George William Joseph Stock

§ 659. Let it be premised that

when the extreme in the premiss that stands first is predicate in the conclusion, we are said to have a Direct Mood;

when the extreme in the premiss that stands second is predicate in the conclusion, we are said to have an Indirect Mood.

§ 660. FIGURE 1.

Mood AA.
All B is A.
All C is B.
.'. All C is A, or Some A is C, (Barbara & Bramantip).

Mood AE.
All B is A.
No C is B.
.'. Illicit Process, or Some A is not C, (Fesapo).

Mood AI.
All B is A.
Some C is B.
.'. Some C is A, or Some A is C. (Darii & Disamis).

Mood AO.
All B is A.
Some C is not B.
.'. Illicit Process, (Ferio).

Mood EA.
No B is A.
All C is B.
.'. No C is A, or No A is C, (Celarent & Camenes).

Mood EI.
No B is A.
Some C is B.
.'. Some C is not A, or Illicit Process.