Non-Aristotelian logic

See:

• General Semantics
• Fuzzy logic
• Neutrosophic logic
• Modal logic[?]
• Paraconsistent logic[?]
• Quantum logic[?]

The concept of non-Aristotelian logic was used by A. E. van Vogt as the central theme in his World of Null-A novels, based on his interest in Alfred Korzybski's General Semantics.

One common interpretation of the theory of Bayesian probability is precisely that probabilities describe degrees of belief[?] in propositions.

See also: Multi-valued logic for another article on this topic.

Compare with: Non-monotonic logic[?] where every statement is true or false, but not immutable.