LessonsThe First Figure: Conditions of Validity and Four Productive MoodsQuiz

Mood 1: Universal affirmative minor + universal affirmative major → universal affirmative conclusion (AAA).
Mood 2: Universal affirmative minor + universal negative major → universal negative conclusion.
Mood 3: Particular affirmative minor + universal affirmative major → particular affirmative conclusion.
Mood 4: Particular affirmative minor + universal negative major → particular negative conclusion (O in conclusion; minor I, major E).

These descriptions list the minor premise before the major. The following examples show how each conclusion follows and why its quantity and quality are fixed.

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The four productive first-figure moods

The First Figure: Conditions of Validity and Four Productive Moods

Mood 1: Universal affirmative minor + universal affirmative major → universal affirmative conclusion (AAA).
Mood 2: Universal affirmative minor + universal negative major → universal negative conclusion.
Mood 3: Particular affirmative minor + universal affirmative major → particular affirmative conclusion.
Mood 4: Particular affirmative minor + universal negative major → particular negative conclusion (O in conclusion; minor I, major E).

These descriptions list the minor premise before the major. The following examples show how each conclusion follows and why its quantity and quality are fixed.