Bochvar's Three-Valued Logic

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This Demonstration presents a simple test for Bochvar's (1939) three-valued logic. The values are: True, False, and Undefined (or Paradoxical or Meaningless), with associated numerical values 1, 0, 1/2, respectively. The value of compound propositions is evaluated according to Bochvar's matrices for internal connectives.
Contributed by: Izidor Hafner (March 2011)
Open content licensed under CC BY-NC-SA
Snapshots
Details
A simple two-dimensional area is occupied by triangles, squares, and pentagons of three different sizes and two colors. If in a statement an individual constant with no reference appears ( in case of a world with two figures
and
), then the statement is meaningless.
S. Haack, Deviant Logic, London: Cambridge University Press, 1974 p. 169.
Permanent Citation
"Bochvar's Three-Valued Logic"
http://demonstrations.wolfram.com/BochvarsThreeValuedLogic/
Wolfram Demonstrations Project
Published: March 7 2011