PHI 1101 Lecture Notes - Lecture 2: Principle Of Bivalence

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

Document Summary

This property of being either true or false brings us to two fundamental laws of logic: the law of non-contradiction, the law of the excluded middle or the law of bivalence. Socrates is not a man - negation of that proposition. For the sake of clarity and brevity, logicians and philosophers sometimes like to represent statements with symbols, or refer to them in a short hand way. They find if very convenient to represent statements with lower case letters like a, b, c or p, q, r. Socrates is not a man. not-p (can also be written -p) Professor: no, you did not pass the test. Professor: you did pass the test, and you did not pass the test. Using a p and a not-p at the same timein the same respect. The sentences we are dealing with obey what is known as the law of.