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Unformatted text preview: 6. ___ Two formulas are logically equivalent iff they both imply each other. 7. ___ The cases relevant to an argument are all the situations in which all of the atomic formulas (the ps and qs) are true. 8. ___ Argument P/C is valid iff the conditional formula P C is a tautology. Part II: In each case, state whether the argument is valid or invalid. Partial credit may be awarded for drawing out truth tables (15 points each) 9. P v Q ~P ~Q 10. P v Q P Q Q 11. P Q ~P ~Q P v Q 12. P Q Q R P R...
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 Spring '08
 Sinhababu

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