PHI 1101 Study Guide - Midterm Guide: Reductio Ad Absurdum, Logica, Stipulative Definition

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

Document Summary

Reductio ad absurdum: an argument which shows that a proposition is false by demonstrating that a contradiction follows it. Consistency: is a property of a set of statements, it is consistent if and only if it is possible for all the statements in that set to be true at the same time, therefore they don"t contradict one another. Simply means both can be true at the same time, not that both are true. Law of excluded middle (law of bivalence): used in a reduction ad absurdum to show that the negation of a proposition is true. Every proposition must be either true or false(no middle) Sorites: a connected series of arguments in which the conclusion of one argument also serves as the premise in another argument. Argument: a set of statements involving the claim that one or more of those statements called the premises supports another of them, the conclusion.