Aristotle's Six Rules

1. A syllogism must have...

2. A syllogism must have...

3. The middle term must be...

4. No term that is undistributed in the premise may be __________ in the conclusion.

5. No syllogism can have ___ negative premises.

6. If one premise is negative, the conclusion must be ________; if the conclusion is ________, one premise must be ________.

Corollary 1. No syllogism may have two ________ __________.

Corollary 2. If a syllogism has a particular premise, it must have a __________ __________.