Lafari@lemmy.world to No Stupid Questions@lemmy.world · 6 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 · 6 months agomessage-square61fedilink
minus-squarekrdo@lmmy.netlinkfedilinkarrow-up1·6 months agoThe first statement only tells you when B is true. It says nothing about when it is false. The second statement both tells you when B is true (if A) and when it is not (only if A). Therefore, the two statements cannot be equal.
The first statement only tells you when B is true. It says nothing about when it is false. The second statement both tells you when B is true (if A) and when it is not (only if A). Therefore, the two statements cannot be equal.