▲ 40 ▼ Is "If A then B" equal to "B if and only if A"? (lemmy.world) submitted 2 years ago by Lafari@lemmy.world to c/nostupidquestions@lemmy.world 60 comments fedilink hide all child comments
[–] zenharbinger@lemmy.world 6 points 2 years ago* (last edited 2 years ago) B can still be true when a is false. iff means that b can only be true when a is true. Also, the equivalent statement is. vehicle if and only if car. not car only if vehicle since a truck is a vehicle, the statement is false. Somewhat wrong above: A B a iff b T T T T F F F T F F F T look online for truth tables. permalink fedilink source parent