| Συγγραφέας: Jan van Eijck 
 
 Jan van Eijck:   An Inference Engine with a Natural Language Interface    (pdf, 40 pages)
 
 ‘all A are B’ ; A ⊆ B ‘no A are B’ ; A ⊆ B ‘some A are not B’ ; A ⊆ B ‘some A are B’ ; A ⊆ B (equivalently: A ∩ B = ∅). A knowledge base is a list of triples  (Class1, Class2, Boolean)  where (A, B, ) expresses that A ⊆ B, and (A, B, ⊥) expresses that A ⊆ B. |