PHI 1101 Lecture Notes - Lecture 20: Modus Tollens, Modus Ponens, Enthymeme

• School: University of Ottawa
• Department: Philosophy
• Course: PHI 1101
• Professor: Laura Byrne

Document Summary

Today: reconstructing arguments and applying what is learned through the republic. Remember: unit 6 you want to defer this until unit 7 due to the fallacies as she thinks the textbook classifies it as wrong in terms of its relevance. Hypothetical syllogism: you"ve had: dejunctive syllogism, modus ponens, modus tollens in units 1-3. The questions on the exam for this new one are going to be similar to the practice questions you"ve done for the other types of arguments on the midterms. It is hypothetical because it is based on what if but it does not go beyond this: to go beyond, you need a subproof of the antecedent. Ex: if you live in montreal, then you live in quebec, if you live in quebec, then you live in. Therefore, if you live in montreal then you live in canada. It is not so much about equals but conditionals. antecedent in the second one.