random
Alex Martelli
aleaxit at yahoo.com
Mon Jun 4 04:51:53 EDT 2001
"Nick Perkins" <nperkins7 at home.com> wrote in message
news:V7xS6.126372$eK2.29676821 at news4.rdc1.on.home.com...
...
> A: (P implies (not D))
> "Given a powerful army, I could not defeat Napolean"
>
> B: (not (P implies D))
> "Having a powerful army would not ensure that I could..."
>
> truth table:
> P D A:(P implies (not D)) B:(not (P implies D))
> 0 0 1 0
> 0 1 1 0
> 1 0 1 1
> 1 1 0 0
>
> The difference is that statement A is true if P is false,
> whereas statement B can only be true if P is true.
> Therefore, statement B implies that P is false.
I think I'm getting confused. From the truth table above,
AND for the immediately preceding statement, I would
deduce the _opposite_ conclusion than yours, i.e., "B
implies that P is _true_". How do you get the "implies
that P is _false_" instead?
Alex
More information about the Python-list
mailing list