PHI 1101 Study Guide - Essentialism, Unit, Soundness

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

Document Summary

Definition: sentence used to make a claim, capable of being either true or false. Can also be called assertions or propositions: differentiates sentences from statements which are incapable of being true of false. Are not: commands, questions, expressions of volition. Laws of logic: law of non-contradiction a. If p is true, then p must be false. Propositions can be combined in groups or sets: socrates is mortal, socrates is a man. Consistency: a set of propositions is consistent if they do not contradict each other. If and only if it is possible for all the sentences in set to be true at the same time. Only possible if the propositions are consistent, but that does not necessarily mean it is true. Inconsistency: contains contradictions and not possible for all propositions to be present at the same time. A relationship between two thoughts that occurs when one thought supports or justifies, or makes it reasonable to believe another thought.