three terms three terms
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categorical syllogism
Three Terms (TT): There must be three and only three terms in a categorical syllogism, each of which is used in exactly the same sense in the entire argument. Each of these terms is used twice but not in the same proposition.
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.
A conclusion.
Not always