An exercise from the book A Mathematical Introduction to Logic

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  • Thread starter GreenApple
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Main Question or Discussion Point

Homework Statement



you are in a land inhabinated by people who either always tell the truth or always tell falsehoods. You come to a fork in the road and you need to know which fork leads to the capital. There is a local resident there, but he has time only to reply to one yes-or-no question. What one question should you ask so as to learn which fork to take?
suggestion: Make a table.


Homework Equations





The Attempt at a Solution



If I asked you 'does the right way lead to the capital?', would you anwser 'yes'?
If the guy reply yes, take the right way. If no, the left.

I am wondering if I am surposed to ask questions about 'future' here?
What exactly does the writer mean by 'make a table'?
 

Answers and Replies

  • #2
HallsofIvy
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That's a perfectly good answer. As far as "make a table", I suspect it refers to having two columns, whether the right or fork is correct, and two rows, whether the person tells the truth or lies, when considering what results a specific question would get.
 

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