Negation

Description

Negation as failure.

Source: The Art of Prolog

Download

Program source code: negation.pl

Listing

/*
 
   not X :- X is not provable.
 
*/
 
	:- op(900, fx, [not]).
 
 
 
     not X :- X, !, fail.
 
     not _.
 
 
 
%  Program 11.6   Negation as failur

Comments

pl/prolog/pllib/negation.txt · ostatnio zmienione: 2017/07/17 08:08 (edycja zewnętrzna)
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