Seven Rules of Validity
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Rule One
Only three terms in a syllogism.
Rule Two
The middle term can not be in the conclusion.
Rule Four
If a term is distributed in the conclusion, it MUST be distributed in the premise as well.
Rule Six
If both premises are positive, the conclusion must be positive.
Rule Seven
If either premise is negative, the conclusion must be negative
Rule Five
No conclusion can follow two negative premises.
Rule Three
The middle term must be distributed at least once.
