PHIL 105 Lecture Notes - Lecture 17: Truth Function, Logical Truth, Trinidad And Tobago Football Association

• School: Simon Fraser University
• Department: Philosophy
• Course: PHIL 105
• Professor: Jonathan Katz

Document Summary

If there are 3 variables then there are 2^3 or 8 outcomes. P andq are goning t be true no matter what. No matter what, it is going to be false= contradiction. ~(p. q) ~p v ~q test to see if there are the same function (if they produce the same output ) pq. Negation in english does not work like negation in math. Wanna find a row where conclusion is false. Find a row where not only q is true but the 2 premises have to be true. P q premise q r premise p r conclusion. Once conclusion is true, can"t make premises false. Proving invalidity only involves 1 row, unlike proving a validity. P is a sentence q is a sentence, p is a sentence, ~q is a sentence. In every row, there is at least 1 f.