Can someone help me with this challenge

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• Oct 18th 2013, 11:30 AM
nikol9942
Can someone help me with this challenge
Twelve University professors and students have been in the library at the time when a very expensive book
on propositional logic has disappeared. Each one entered once,stayed some time and left. If two of
them were in the library at the same time then at least one saw the other. Police interviewed these
students and professors and gathered the following evidence:
- Sem said that he saw Bryan and Zelda in the library.
- Caitlin swore that she saw George and Holly.
- Bryan said that he saw Sem and Vanessa.
- Maria claimed that she saw David and Vanessa.
- Nicolas said that he saw Alexander and Jana.
- David said that he saw Bryan and Zelda.
- Holly claimed that she saw Nicolas and Jana.
- Zelda testified that she saw Bryan and Maria.
- George said that he saw Alexander and Jana.
- Vanessa said that she saw Maria and Zelda.
- Alexander said that he saw George and Caitlin in the library.
- Jana said that she saw Holly and Caitlin.

thank you.. ;)))
• Oct 18th 2013, 04:01 PM
Shakarri
Re: Can someone help me with this challenge
So you need to find the person who was in the library alone? Assuming no one can lie
• Oct 19th 2013, 01:36 AM
nikol9942
Re: Can someone help me with this challenge
No i dont have to find who was alone in the library i have to find who has stolen the book If two of them were in the library at the same time then at least one saw the other...
• Oct 19th 2013, 02:14 AM
Shakarri
Re: Can someone help me with this challenge
Well how do you decide who stole the book? Is it the person who was not seen in the library?
• Oct 19th 2013, 06:45 AM
tom@ballooncalculus
Re: Can someone help me with this challenge
Quote:

Originally Posted by Shakarri
Assuming no one can lie

Apparently not

http://mathhelpforum.com/discrete-ma...ity-level.html
• Oct 24th 2013, 01:49 PM
nikol9942
Re: Can someone help me with this challenge
ahh but on these link is no answer.. :))