Conflict-Freeness (ADF)
A three-valued interpretation of an ADF is a conflict-free model iff for every , implies for some completion , and implies for some .
Reference
Strass, H. & Wallner, J.P. (2015). Analyzing the Computational Complexity of Abstract Dialectical Frameworks via Approximation Fixpoint Theory. Artificial Intelligence, 226, pp. 34–74.