Fog Creek Software
Discussion Board




Vienna

the /solution/ tells us to ask "if you were to ask yourself which way to Vienna, what would you say?". I think that's a very bad quedstion: the liar (here he is called to be a knave) might think "the question ist way to vienna - I'm lying while asking, so I'd ask 'which is the way to [some place but vienna]?'". This makes the whole thing worthless. A lie isn't a boolean equation!

Franz
Saturday, June 26, 2004

Plus, the question "Which is the road to Vienna" has lots of possible answers: Left, right, and "Back the way you came", for examples.

The question: "Is THIS (pointing) the road to Vienna" really has only two possible answers - Yes and No.

Brad Corbin
Monday, June 28, 2004

Really two? Maybe! Maybe? ;-)

SCNR

Franz
Tuesday, June 29, 2004

the correct question to ask anyone of the 2 is:
"If I asked you which is the way to Vienna, what would you answer me?"

The knight will point the correct direction.
The knave would answer the wrong way, but he will lie about it. So he will show the correct way.

Another possible question: "If I ask your pal what is the way to Vienna, what would he tell?"

Both will show the wrong way.

AL
Friday, January 14, 2005

*  Recent Topics

*  Fog Creek Home