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Negative conclusion from affirmative premises

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Cogito ergo sum
Logic and rhetoric
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Key articles
General logic
Bad logic

A negative conclusion from affirmative premises (also illicit affirmative) occurs when a categorical syllogism has a negative conclusion, but two affirmative premises.

It is a syllogistical fallacy and a formal fallacy.

Forms

You commit this fallacy if you use either of the following false syllogisms:

P1: Some A are B.
P2: Some B are C.
C: Some A are not C


P1: Some A are B.
P2: Some B are C.
C: No A are C.

See also

External links