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section_handout_1.26 - Phil12A Jonker 25 January 2011 1 How...

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Phil12A, Jonker, 25 January 2011 1 How much do you know? Consider a first-order language that has the names Jesse , Kendall , Lou , Maria and Nate , and the function symbols leftof(x) referring to the person to the left of x (from your perspective), and rightof(x) referring to the person to the right of x (from your perspective). Furthermore the language has the pred- icate Taller(x,y) , meaning x is taller than y, and x=y , meaning x and y are the exact same person. 1. Formalize the following English sentences: (a) The person standing to the left of the person standing to the left of Nate is standing to the right of Maria. (b) The person standing to the right of Kendall is shorter than Maria. (c) Jesse is taller than Maria. (d) Lou is shorter than Kendall. 2. Jesse, Kendall, Lou, Maria and Nate (and nobody else) are lined up from tallest (on your left) to shortest (on your right). In what order are they lined up if the above sentences are all true?
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