A logical structure which does not assume the law of the excluded middle. Three truth values are possible: true, false, or undecided. There are 3072 such logics.

# Three-Valued Logic

## See also

Fuzzy Logic, Law of the Excluded Middle, Logic## Explore with Wolfram|Alpha

## Cite this as:

Weisstein, Eric W. "Three-Valued Logic."
From *MathWorld*--A Wolfram Web Resource. https://mathworld.wolfram.com/Three-ValuedLogic.html