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BSD-3-Clause licensed by Stefan Holdermans, Johannes Riecken
Multisets (or bags) are sets in which elements may occur more than once.
The number of times an element occurs in a multiset is called its
multiplicity.
This package provides an efficient implementation of so-called
signed multisets (also known as hybrid sets or shadow sets), which
generalise multisets by allowing for negative membership.
That is, elements in a signed multiset can have negative multiplicities.
See also: Wayne D. Blizard. Negative membership.
Notre Dame Journal of Formal Logic, 31(3):346--368, 1990.
