Distribution:
Distribution of Subject Terms

The subject term is distributed if the proposition is universal (A or E) and undistributed if the proposition is particular (I or O).

A statement about all Ss obviously makes a claim about the whole class, so S in this case is distributed. Just as obviously, a statement about some Ss does not make such a claim, so S in this second case is undistributed.

Similarly, "No S is P" says something about the entire class of Ss, so that the subject is distributed. "Some S are not P" does not cover all the Ss, so the subject there is undistributed.

For the subject term, what matters is quantity. Quality is irrelevant.


Distribution of predicate terms

Distribution

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