Logic / Logic 128 · Atom · ~20 seconds
"If" vs. "Only If"
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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.
Unlocks
- Nothing yet depends on this.