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Kleene's Three-Valued Logic

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language of predicates
Slovenian
English
number of elements
3
number of statements
5
number of negated statements
5
help
show truth tables
This Demonstration presents a simple test for Kleene's three-valued logic. The values are: True, False, and Undefined (or Unknown or Undecided), with associated numerical values 1, 0, 1/2, respectively. The value of compound propositions is evaluated according to Kleene's truth tables.
A simple two-dimensional area is occupied by triangles, squares, and pentagons of three sizes and two colors. A disk-shaped figure means that the shape of the element is not known. In this case a proposition of type Shape(
x
) has value "undefined".
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