An OAE-1 is a specific categorical syllogism. More accurately, it is representative of the Mood and Figure of the categorical syllogism. The OAE represents the Mood, which in this case is "Some M are not P, All S are M, and therefore All S are not P."
The "-1" represents the Figure, which is determined by the location of the Middle term (represented by M). As you can see, this categorical syllogism is Invalid, because the conclusion that All S are not P is not necessarily true, even if both of the Premises (Some M are not P and All S are M) are true.
Tl;Dr
It's an Invalid Categorical Syllogism.
Some M are not P
All S are M
________________
All S are not P
Chat with our AI personalities
Affirmative Syllogism: All P are Q X is a P X is a Q Negative Syllogism: All P are Q X is not a Q X is not P Both syllogisms are always valid. but dont be fooled by their evil twins the fallacy of affirmation and the fallacy of negation.
categorical syllogism
A conclusion.
Not always
three terms three terms