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hw4.pdf - Philosophy 1115 Homework Assignment #4 November...

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Philosophy 1115 Homework Assignment #4November 6, 2020Six Validity Testing Problems (Truth-Table Methods)Use a truth-table method (either the exhaustive method, or the “short” method)to determine whether each of the following three (3) LSL arguments/sequentsis valid or invalid. For the “short” method, follow the guidelines discussed inlecture for presenting answers (viz., see my handout with 3 examples).1.A!CB!CA_BêC2.I!N(K_D)$ND!IêI!(N!K)3.(O!S)&(O!(M&I))I!MêSFor the next three, follow the directions in the text (i.e., use the “short” method).4. Page 66, I: #15. Page 66, I: #56. Page 66, I: #8
The LSLargument is validbecause, in boththe “exhaustive”and “short”methods, therewas no evidenceof its premisesbeing true and itsconclusion false.Based on the “short” method, this LSLargument is invalid.Using the “short” method, I have concluded that this LSL argument is valid. When theconclusion ‘~S’ is false, ‘S’ must be true. For the first premise to be true, bothconjunctions must be true as well. With ‘~S’ being false, it forces ‘~O’ in the firstconjunction to be false. In the second conjunction, ‘O’ must be true since ‘~O’ is false. To

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Term
Spring
Professor
Fitelson
Tags
logical consequence

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