Negative conclusion from affirmative premises

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An affirmative conclusion from a negative premise (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.

[edit] Forms

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


P1: Some A are B.
P2: Some B are C.
C1: Some A are not C


P1: Some A are B.
P2: Some B are C.
C1: No A are C.

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