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Integer Arithmetic - "left as an exercise" that is too difficult #41

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prologbyexample opened this issue Oct 25, 2022 · 0 comments
Open

Integer Arithmetic - "left as an exercise" that is too difficult #41

prologbyexample opened this issue Oct 25, 2022 · 0 comments

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@prologbyexample
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prologbyexample commented Oct 25, 2022 •
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The section on integer arithmetic and constraint programming at https://www.metalevel.at/prolog/clpz explains that the list_length/2 predicate does not terminate when asked to find a list that has a specified length.

?- list_length(Ls, 3), false.
nontermination

"It takes only a single additional goal to make this query terminate. This is left as an exercise."

I have struggled to find what this single additional goal is. I have tried days of reading popular texts on prolog, googling and even asking on stackexchange.

I would love an answer or a link to an answer.
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