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I am having a problem with prolog that I do not understand. I have used the tracer to follow the problem, and this is what happens
....
(8) 8 NEXT value(debt, p9, Orly)
(8) 8 *EXIT value(debt, p9, low)
(9) 8 CALL P is low
S (10) 9 CALL error_handler(21, P is low, eclipse, sepia_kernel)
...error crap, more "leaves" calls....
What is wrong with the call, “P is low”?
low is an atom, not a mathematical expression that could be evaluated. Maybe you want to write it in upper case, i.e. Low, so that it is a variable?