negation

n.

反面；对立面；否定；否认

1. This political system was the negation of democracy.
   这种政治制度是对民主的否定。
2. She shook her head in negation.
   她摇头表示拒绝。

Negation as failure
Negation as Failure.
Why not negation by fixpoint?
Why not negation by fixpoint?
Why not negation by fixpoint?
A Natural History of Negation
Logic programming and negation: A survey
Logic Programs with Classical Negation
Logic programs with classical negation
Classical negation in logic programs and disjunctive databases