Contraposition
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
Contraposition swaps the terms and replaces both with complements. Valid for A and O only.
Show
"All S are P" becomes "All non-P are non-S."
Watch for
Conversion works for E and I; contraposition for A and O. Mixing up which operation serves which forms is this unit's signature error.