Lesseq operator


The less than or equal relation.

Source: The Art of Prolog


Program source code: lesseq_operator.pl


	X lesseq Y :-  X and Y are natural numbers,
	  		  such that X is less than or equal to Y.
We use lesseq to represent the operator rather than cause problems
with an error message from Prolog about redefining an operator!
	:- op(40,xfx, 'lesseq').
	0 lesseq X :- natural_number(X).
	s(X) lesseq s(Y) :- X lesseq Y.
	natural_number(s(X)) :- natural_number(X).
%	Program 3.2: The less than or equal relation


pl/prolog/pllib/lesseq_operator.txt · ostatnio zmienione: 2019/06/27 15:50 (edycja zewnętrzna)
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