signed-multiset: Multisets with negative membership.

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, 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.

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• signed-multiset-0.1.tar.gz [browse] (Cabal source package)
• Package description (as included in the package)

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• StefanHoldermans, rieckenj

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