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* Copyright (c) University of Toronto and others. All rights reserved.
* The content of this file is licensed under the Creative Commons Attribution-
* ShareAlike 4.0 Unported license. The legal text of this license can be
* found at
* Original Author:
* Praha Ladislav NEBESKY
* Contributors:
* Carmen Chui, Michael Gruninger
(cl-comment 'Axioms are from A new approach to chordal graphs')
(cl-comment 'See')
(cl-comment 'Axiom: A1')
(forall (u v w)
(if (S u v w)
(S v u u)))
(cl-comment 'Axiom: A2')
(forall (u v w)
(if (S u v w)
(and (not (= w u))
(not (= u v)))))
(cl-comment 'Axiom: A4')
(forall (u v w)
(if (and (S u v w)
(not (= v w)))
(exists (y)
(and (S v y w)
(not (= y u))
(not (S u y y))))))
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