[Haskell-cafe] ANN: signed-multiset-0.1

[Stefan Holdermans]

Ivan,

>> 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.

> Wait, something can be not in the multiset more than once? :o

That's correct. :)

Cheers,

  Stefan