Comment on Is "If A then B" equal to "B if and only if A"?
Boinkage@lemmy.world 5 months agoYa wrong.
If Tuesday, then pizza. And, if Friday, then pizza.
The contrapositive : if not pizza, then not Tuesday and not Friday.
What day is it? We’re not having pizza. So it’s not Tuesday or Friday.
XeroxCool@lemmy.world 5 months ago
That’s a key detail I now see