The conclusion of a standard form categorical syllogism is affirmative, but at least one of the premises is negative. Any valid forms of categorical syllogisms that assert a negative premise must have a negative conclusion.
Examples:
- No people under the age of 66 are senior citizens. No senior citizens are children. Therefore, all people under the age of 66 are children.
Synonyms: illicit negative, drawing a negative conclusion from negative premises, fallacy of negative premises