is_set/1

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Predicate is_set/1

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Availability::- use_module(library(lists)).(can be autoloaded)

Source

[semidet]is_set(@Set)

True if Set is a proper list without duplicates. Equivalence is based on ==/2. The implementation uses sort/2, which implies that the complexity is N*log(N) and the predicate may cause a resource-error. There are no other error conditions.