Intuitionism and the Excluded Middle
Introductory lessons on Logic often make note of three basic, but powerful, principles which are so universally recognized that they are commonly referred to as the Laws of Logic. The first is the Law of Identity which states something like, “A thing is equal to itself.” The second is the Law of Non-Contradiction, sometimes phrased as, “A proposition cannot be both true and false at the same time.” The third is known as the Law of the Excluded Middle which declares, “Either a given proposition is true or else its negation is true.”
A classic example of the Law of Identity might be, “Socrates is Socrates.” An illustration of Non-Contradiction could be, “Socrates cannot both be mortal and not be mortal at the same time.” For the Excluded Middle, we would say, “Either Socrates is mortal or else Socrates is not mortal.” This all seems perfectly obvious and simple, even to complete beginners in the study of Logic.
However, one might be surprised to learn that the Law of Excluded Middle is actually a source of some controversy in philosophy– particularly in the Philosophy of Mathematics, where there exists a small but strong community which rejects this principle vehemently.