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Math Help - Can someone help me with this challenge

  1. #1
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    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.. ))
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  2. #2
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    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
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  3. #3
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    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...
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  4. #4
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    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?
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  5. #5
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    Re: Can someone help me with this challenge

    Quote Originally Posted by Shakarri View Post
    Assuming no one can lie
    Apparently not

    Propositional Logic challenge (university level)
    Last edited by tom@ballooncalculus; October 19th 2013 at 07:24 AM.
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  6. #6
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    Re: Can someone help me with this challenge

    ahh but on these link is no answer.. )
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