excluded middle

The absolute fact comes under the Law of Excluded Middle, but a personal opinion is not an absolute fact.

From this law of thought follows directly the third, viz., the Principle of the Excluded Middle.

With these three intellectual laws of identity, of contradiction, and of the excluded middle, formal logic begins.

These rules are very far from being self-evident, any more than the maxims of Contradiction and of the Excluded Middle.

If there is a mean, the conditioned, and the two extremes, then "excluded middle" has nothing to do with the matter at all.