Paraconsistent Semantics for Extended Fuzzy Logic Programs via Approximation Fixpoint Theory [Extended Version]

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Hauptverfasser: Kettmann, Pascal, Strass, Hannes, Heyninck, Jesse, Spaans, Jeroen
Format: Preprint
Veröffentlicht: 2026
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author Kettmann, Pascal
Strass, Hannes
Heyninck, Jesse
Spaans, Jeroen
author_facet Kettmann, Pascal
Strass, Hannes
Heyninck, Jesse
Spaans, Jeroen
contents In logic programming, negation can be interpreted in various ways. Probably best known is the concept of "negation as failure", where "$\mathit{not}\, p$" is true if we have no evidence for $p$. On the other hand, strong negation requires that we have evidence for $p$ being false. Defining semantics for logic programs containing both kinds of negation is a challenging task, and this becomes even more challenging when combining this with other extensions of logic programming, e.g. fuzziness. In this work, we use the framework of approximating fixpoint theory to formulate well-behaved semantics for fuzzy logic programs containing both "by-failure" and strong negation. We show that this framework generalizes several existing semantics as well as giving rise to a host of new semantics.
format Preprint
id arxiv_https___arxiv_org_abs_2605_05286
institution arXiv
publishDate 2026
record_format arxiv
spellingShingle Paraconsistent Semantics for Extended Fuzzy Logic Programs via Approximation Fixpoint Theory [Extended Version]
Kettmann, Pascal
Strass, Hannes
Heyninck, Jesse
Spaans, Jeroen
Logic in Computer Science
In logic programming, negation can be interpreted in various ways. Probably best known is the concept of "negation as failure", where "$\mathit{not}\, p$" is true if we have no evidence for $p$. On the other hand, strong negation requires that we have evidence for $p$ being false. Defining semantics for logic programs containing both kinds of negation is a challenging task, and this becomes even more challenging when combining this with other extensions of logic programming, e.g. fuzziness. In this work, we use the framework of approximating fixpoint theory to formulate well-behaved semantics for fuzzy logic programs containing both "by-failure" and strong negation. We show that this framework generalizes several existing semantics as well as giving rise to a host of new semantics.
title Paraconsistent Semantics for Extended Fuzzy Logic Programs via Approximation Fixpoint Theory [Extended Version]
topic Logic in Computer Science
url https://arxiv.org/abs/2605.05286