part 2-5 basic components, structure and logic of argumentation

Ii frank lives in genesee county iii therefore frank

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: e city of Davison, MI also lives in Genesee County. ii. Frank lives in Genesee County. iii. Therefore, Frank lives in the city Davison, MI. If P, then Q. Q Therefore, P Generalization i. Anyone who lives in the city of Davison, MI also lives in Genesee County. ii. Frank does not live in the city Davison, MI. iii. Therefore, Frank does not live in Genesee County. If P, then Q. Not P. Therefore, not Q. Generalization Invalid Argument Forms i. All smurfs are snorks ii. All ewoks are snorks iii. Therefore, All smurfs are ewoks Generalizations All P are Q All R are Q Therefore, P are R i. Either you’re with me or you’ X or Y re against me. not X ii. You’re not with me. Therefore, Y iii. So, you must be against me. False Dichotomy Invalid Arguments- A False Cause Premise Every time there is someone in the front yard, Spot barks. Premise Spot is barking, Conclusion so someone must be in the front yard Premise If X then Y Premise Y Conclusion Therefore, X Invalid Arguments Premise All dogs have four legs. Premise Francis the Talking Mule is not a dog Conclusion Therefore, Francis the Talking Mule does not have four legs Premise All X are Y Premise not X Conclusion Therefore, Not Y Invalid Arguments Premise If Obama is president, then a Democrat is president Premise A Democrat is president Conclusion Therefore, Obama is president Premise If X then Y Premise Y Conclusion Therefore, X Invalid Arguments Premise If my power goes out, then my cable TV goes out. Premise My power is not out, Conclusion therefore, my cable TV is not out. Premise If X then Y Premise not X Conclusion Therefore, Not Y Invalid Arguments Premise If I am with the one I love, then I am happy. Premise I am happy. Conclusion Therefore, I am with the one I love Premise If X then Y Premise Y Conclusion Therefore, X FINAL NOTE: Valid or Invalid? FOR VALID arguments: the addition of extra premises can not change the conclusion - a valid conclusion reached from a set of premises can never be changed by the addition of new premises. Also, it is impossible for the premises of a valid argument to be true and the conclusion to be false FOR INVALID arguments: the addition of new premises will many times strengthen or weaken a given conclusion. Also, it is possible for the conclusion of an invalid argument to be false even if it has true premises. Spotting Valid and Invalid Arguments i. If A, then B. ii. B. iii. So, A. i. All monkeys have blue teeth ii. Meg is a monkey iii. Therefore Meg has blue teeth i. All OSU fans are arrogant. ii. All arrogant people are dumb. iii. So, all OSU fans are dumb. i. Shermer and Randi are Arabic. ii. Shermer and Randi are cops iii. So, some Arabs are cops. i. If my astrologer is clairvoyant, then she predicted my travel plans correctly. ii. She predicted my travel plans correctly. iii. So, my astrologer is clairvoyant. i. If God created the universe, we should observe order and design in Nature. ii. We do observe order and design in Nature. iii. So, God created the universe. Unsound Ar...
View Full Document

Ask a homework question - tutors are online