The Liar and Related Paradoxes: Fuzzy Truth Value Assignment for Collections of Self-Referential Sentences
<|reference_start|>The Liar and Related Paradoxes: Fuzzy Truth Value Assignment for Collections of Self-Referential Sentences: We study self-referential sentences of the type related to the Liar paradox. In particular, we consider the problem of assigning consistent fuzzy truth values to collections of self-referential sentences. We show that the problem can be reduced to the solution of a system of nonlinear equations. Furthermore, we prove that, under mild conditions, such a system always has a solution (i.e. a consistent truth value assignment) and that, for a particular implementation of logical ``and'', ``or'' and ``negation'', the ``mid-point'' solution is always consistent. Next we turn to computational issues and present several truth-value assignment algorithms; we argue that these algorithms can be understood as generalized sequential reasoning. In an Appendix we present a large number of examples of self-referential collections (including the Liar and the Strengthened Liar), we formulate the corresponding truth value equations and solve them analytically and/ or numerically.<|reference_end|>
@article{vezerides2003the,
    title={The Liar and Related Paradoxes: Fuzzy Truth Value Assignment for
  Collections of Self-Referential Sentences},
    author={K. Vezerides and Ath. Kehagias},
    journal={arXiv preprint arXiv:cs/0309046},
    year={2003},
    archivePrefix={arXiv},
    eprint={cs/0309046},
    primaryClass={cs.LO}
}