Four-valued logic
A four-valued logic is any logic with four truth values. Several types of four-valued logic have been advanced.
A four-valued logic is any logic with four truth values. Several types of four-valued logic have been advanced.
A four-valued logic is any logic with four truth values. Several types of four-valued logic have been advanced.
Source: Wikipedia "Four-valued logic" · CC BY-SA 4.0
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