"If" vs. "Only If"
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
"If" introduces the antecedent; "only if" introduces the consequent; "if and only if" welds them into ≡.
Show
"You pass if you score 60" makes a 60 sufficient; "you pass only if you score 60" makes it merely required. Converse claims, not the same claim.
Watch for
This pair sorts every logic student into two groups. Drill it until you're in the right one.
Builds on
Unlocks
- Nothing yet depends on this.