Add is_empty and is_singleton to multiset #1246
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tjhance
approved these changes
Aug 25, 2024
source/vstd/multiset.rs
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| /// A multiset has exactly one element, if and only if, it has at least one element with multiplicity 1 and any two elements are equal. | ||
| pub proof fn lemma_is_singleton(s: Multiset<A>) | ||
| ensures | ||
| s.is_singleton() == (s.len() == 1), |
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We usually use <==> when comparing bools like this.
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I'm migrating code from Set to MultiSet and found that there is no spec function
is_emptyandis_singletonfor MultiSet. So I add these two functions inmultiset.rsand prove several lemmas about them imitating those inset_lib.rs.