# Degree of truth

In classical logic, propositions are typically unambigously considered as being true or false. For instance, the proposition *one is both equal and not equal to itself* is regarded as simply false, being contrary to the Law of Noncontradiction; while the proposition *one is equal to one* is regarded as simply true, by the Law of Identity. However, some mathematicians, computer scientists, and philosophers have been attracted to the idea that a proposition might be *more or less* true, rather than wholly true or wholly false. Consider *My coffee is hot*.

In mathematics, this idea can be developed in terms of fuzzy logic. In computer science, it has found application in artificial intelligence. In philosophy, the idea has proved particularly appealing in the case of vagueness. Degrees of truth is an important concept in law.

## See also

- Language:

- Technology:

- Logic:

- Bivalence
- Fuzzy logic
- Fuzzy set
- Half-truth
- Multi-valued logic
- Paradox of the heap
- Truth
- Truth value
- Vagueness

- Books:

## Bibliography

- Zadeh, L.A. (1965). "Fuzzy sets".
*Information and Control*.**8**(3): 338–353. doi:10.1016/S0019-9958(65)90241-X. ISSN 0019-9958.