Week 4: Existential Fallacy
Week 4: Existential Fallacy Phil 110
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This 1 page Class Notes was uploaded by Heather Adams on Saturday September 26, 2015. The Class Notes belongs to Phil 110 at Colorado State University taught by Mr. Edward Lenzo in Fall 2015. Since its upload, it has received 16 views. For similar materials see Logical and Critical Thinking in PHIL-Philosophy at Colorado State University.
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Date Created: 09/26/15
92215 Existential Fallacy Committed when concluding a particular proposition from all universal premises No existence claims in universals Particular s have existential import Part of Boolean Modern interpretation of Aristotelian Classical Category Logic Particular premises 3 P Universal Conclusion I Some 8 are P l and ParticularAffirmative If true then E is false because E is Contradictory of l Some nonP are 8 take converse and obverse transform into Some 8 are not P continue in the cycle taking contrapositive and obverse to get back to the original Some nonP are S Could also take the reverse obverse then contrapositive to get to Some 8 are not P Always take two options to get you to the desired proposition and once there can keep going to get back to the original All P are non S obverse to get No P are S When possible to get rid of non should only take 12 steps It wont be possible to get rid of the non s in these cases Some non P are non S or All P are 8 92415 Identification standard from OuantifierSubjectCopulaPredicate OuantifierCopula Form Quantity Quality Allare A Universal Affirmative Noare E Universal Negative Someare Particulare Affirmative Someare not O Particulare Negative2 Propositions are equivalent if they have the same truth value Valid inference when propositions are equivalent Converse Obverse Contrapositive Contradictory Switch 8 and P Change quality Switch 8 and P Change Quantity and compliment and Compliment and Quality Predicate both A Not Equivalent Equal Equal Opposite E Equivalent Equal Not Equivalent Opposite l Equivalent Equal Not Equivalent Opposite O Not Equivalent Equal Equal Opposite
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