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Unformatted text preview: DeM, 3 5. ~G simp, 4 6. ~G ~~G 5,2, Conj always start with invalidity 9.10 Section A exercises Try to demonstrate invalidity If theres one interpretation which demonstrates the arguments invalidity, then stop If no such interpretation, then you have to demonstrate its validity by constructing a proof S T (T S) UT v (~T ~U) (U v V) v (S v T) ~U (WX) (V...
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This note was uploaded on 03/16/2011 for the course PHIL 045 taught by Professor Hopper during the Fall '07 term at GWU.
 Fall '07
 Hopper

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