MODR 1711 Lecture Notes - Lecture 5: Categorical Logic, Informal Logic, Natural Deduction

• School: York University
• Department: Modes Of Reasoning
• Course: MODR 1711
• Professor: Hilary Davis

Document Summary

Court case: read it and do diagram and fallacies. Identify arguments (proposition 1 premises, conclusion), sentences, concepts, word) 2. Assessing arguments (fallacy analysis focus on content, idea) Now we focus on formal reasoning (x-ray, skeletal) 1. every action that disrespects another person is wrong. Formal reasoning: categorical logic no ifs, and or buts - all, none, some, hypothetical / deductive logic if . the(cid:374) clai(cid:373)s (cid:894) (cid:272)o(cid:374)ditio(cid:374)als(cid:895) - either ,or (not both) ) disjunctions) 2 test : 1. Syllogism: argument , 3 proposition , 2 premises and 1 conclusion. P 2: all b is inside of c. Truth vs validity: truth : content of the premises /conclusion, validity : form or structure of argument, paradoxes a. valid , but one more false premises. P1 : all glendon students are artist (false) Necessarily, if the premises are true the conclusion is true: true premises, true conclusion but invalid. Invalid argument: possible for premises to be true and the conclusion false.