Lafari@lemmy.world to No Stupid Questions@lemmy.world · 7 months agoIs "If A then B" equal to "B if and only if A"?message-squaremessage-square61fedilinkarrow-up151arrow-down111
arrow-up140arrow-down1message-squareIs "If A then B" equal to "B if and only if A"?Lafari@lemmy.world to No Stupid Questions@lemmy.world · 7 months agomessage-square61fedilink
minus-squarezenharbinger@lemmy.worldlinkfedilinkarrow-up6·edit-27 months agoB 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.
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.