@Lafari to No Stupid Questions • 11 months agoIs "If A then B" equal to "B if and only if A"?message-square61arrow-up151arrow-down111
arrow-up140arrow-down1message-squareIs "If A then B" equal to "B if and only if A"?@Lafari to No Stupid Questions • 11 months agomessage-square61
minus-square@[email protected]linkfedilink14•11 months agoIf A, then B If Not B, then Not A If it’s raining then the grass is wet, but you can’t tell if it’s raining if the grass is wet, because of say, a hose or sprinkler. All that you can tell is that if the grass is dry, then it is not raining, and I that’s called a contrapositive.
If A, then B
If Not B, then Not A
If it’s raining then the grass is wet, but you can’t tell if it’s raining if the grass is wet, because of say, a hose or sprinkler.
All that you can tell is that if the grass is dry, then it is not raining, and I that’s called a contrapositive.