▲ 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
[–] ook_the_librarian@lemmy.world 1 point 2 years ago* (last edited 2 years ago) "If A then B" means if A is true, then B is guaranteed to be true. Note that if B is true and A is false, "if A then B" is still true. "B only if A" means the only way for B to be true is for A to be true. It's weird, but it has the inverse truth table as "(not A) and B". permalink fedilink source parent