Logic / Logic 079 · Atom · ~20 seconds
Contradictories
Video not yet published
to the StudyWalks catalog
to the StudyWalks catalog
State
A and O are contradictories; so are E and I. Contradictories always have opposite truth values.
Show
If "All S are P" is true, "Some S are not P" is false — necessarily, and vice versa.
Watch for
This is the one square-of-opposition relation that survives every interpretation. The rest come with fine print.