Which opposition is the relation between two propositions having the same subject and predicate but differing in quantity only?

Two propositions with the same subject and predicate differing only in quantity stand in sub-alternation.

The pairs are A with I and E with O.

They share quality but differ in quantity, one universal and one particular.

Truth of the universal forces truth of the particular, but not the reverse.

This same-quality, different-quantity relation is sub-alternation.