SSH 105 Lecture Notes - Lecture 6: Logical Reasoning, Deductive Reasoning, Modus Ponens

• School: Ryerson University
• Department: Social Science and Humanities
• Course: SSH 105
• Professor: All

Document Summary

Lecture 6: pre-quiz office hours feb 27 12-3 pm. Inductive arguments: premises are intended to give probable, not conclusive, support for the conclusion. Cogency: an argument is cogent if and only if it is not valid, but the premises of the argument are good reasons for the conclusion, otherwise the argument is not cogent, 1. Quitting smoking tends to improve one"s health: 2. If the answer is yes then the argument is cogent, If the answer is no then the argument is non-cogent: probably always indicates an inductive argument. Arguments that are invalid and non-cogent are called ill formed since the premises do not guarantee that the conclusion is true or even probable. Validity does not come in degrees: an argument is either valid or invalid, period. Cogency does come in degrees, one argument can be more or less cogent than the other.