| Phi 270 Fall 2013 |
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Phi 270 F06 test 2
F06 test 2 topics
The following are the topics to be covered. The proportion of the test covering each will approximate the proportion of the classes so far that have been devoted to that topic. Your homework and the collection of old tests will provide specific examples of the kinds of questions I might ask.
Analysis. Be able to analyze the logical form of a sentence as fully as possible using conjunction and present the form in both symbolic and English notation.
Synthesis. Be able to synthesize an English sentence that has a given logical form.
Derivations. Be able to construct derivations to show that entailments hold and to show that they fail. I may tell you in advance whether an entailment holds or leave it to you to check that using derivations. There will be at least one derivation where detachment and attachment rules may be used and where they will shorten the proof. But there will be other derivations where you must rely on other rules, either because detachment and attachment rules do not apply or because I tell you not to use them.
I may also ask you to explain why a derivation rule works or does not work. This may be one of the rules you have available for use or another conceivable rule that is not part of the system we use. (For an example of a question of this sort, see question 7 of test 1 for 2000.)
F06 test 2 questions
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Analyze each sentence below in as much detail as possible, presenting the result in both symbols and English notation (using |
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Sam was cool, but he was not both calm and collected. answer |
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| 2. |
Tom spoke to either Al or Barb but to neither Carol nor Dave. answer |
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Synthesize an English sentence (the more idiomatic the better) that has the following analysis: |
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| 3. |
¬ E ∨ F (E: Ed worked last weekend; F: Fred worked last weekend) answer |
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Use derivations to check whether each of the entailments below holds. If one fails, confirm a counterexample by providing a table in which you calculate the truth values of the premises and conclusion on an extensional interpretation (i.e., an assignment of truth values) that lurks in an open gap. |
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Do not use attachment or detachment rules in 4-6. That is, do not use Adj or the rules MTP, MPT, and Wk of §4.3; instead use only the basic rules for exploiting resources, planning for goals, and closing gaps. |
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| 4. |
A ∧ B ⊨ ¬ (C ∧ ¬ B)
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| 5. |
¬ (A ∧ B), ¬ A ⊨ B
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| 6. |
C, A ∨ B ⊨ A ∨ (B ∧ C)
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In 7 you may use attachment and detachment rules (and their use can simplify the derivation). |
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| 7. |
¬ (A ∧ C), A ∨ B ⊨ B ∨ ¬ C
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F06 test 2 answers
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