LafaritoNo Stupid Questions@lemmy.world·9 months agoIs "If A then B" equal to "B if and only if A"?message-squarearrow-up151arrow-down111message-square61fedilink
arrow-up140arrow-down1message-squareIs "If A then B" equal to "B if and only if A"?LafaritoNo Stupid Questions@lemmy.world·9 months agomessage-square61fedilink
minus-squarekrdoarrow-up1arrow-down0·9 months agolinkfedilinkThe 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.