Full Idea
The Kripke-Feferman theory KF is an axiomatisation of the fixed points of an operator, that is, of a Kripkean fixed-point semantics with the Strong Kleene evaluation schema with truth-value gluts.
Clarification
A 'glut' comes when sentences can be both T and F
Gist of Idea
Kripke-Feferman theory KF axiomatises Kripke fixed-points, with Strong Kleene logic with gluts
Source
Volker Halbach (Axiomatic Theories of Truth [2011], 15.1)
Book Reference
Halbach,Volker: 'Axiomatic Theories of Truth' [CUP 2011], p.211
Related Idea
Idea 14263 Strong Kleene disjunction just needs one true disjunct; Weak needs the other to have some value [Fine,K]