Lafari to No Stupid Questions · 2 years agoIs "If A then B" equal to "B if and only if A"?message-squaremessage-square60linkfedilinkarrow-up151arrow-down111
arrow-up140arrow-down1message-squareIs "If A then B" equal to "B if and only if A"?Lafari to No Stupid Questions · 2 years agomessage-square60linkfedilink
minus-squareThoth19linkfedilinkarrow-up1·2 years agoI mean it is the definition of “if and only if”. And by commutativity we also know that A iff B is equal to B iff A
minus-squareRhynoplazlinkfedilinkarrow-up2·2 years agoOh yeah. I was very confused as to what that meant, but I learned something today.
minus-squareThoth19linkfedilinkarrow-up1·2 years agoYeah if vs iff can be confusing at first. Trying to understand it with normal grammar doesn’t work right. It’s a lot more helpful to grok the symbols and so the truth tables by hand to see how they fit together
I mean it is the definition of “if and only if”. And by commutativity we also know that A iff B is equal to B iff A
Oh yeah. I was very confused as to what that meant, but I learned something today.
Yeah if vs iff can be confusing at first. Trying to understand it with normal grammar doesn’t work right. It’s a lot more helpful to grok the symbols and so the truth tables by hand to see how they fit together