category-extras-0.53.6: Various modules and constructs inspired by category theoryContentsIndex
Control.Morphism.Span
Portabilitynon-portable (rank-2 polymorphism)
Stabilityexperimental
MaintainerEdward Kmett <ekmett@gmail.com>
Description
Spans and Cospans http://en.wikipedia.org/wiki/Span_(category_theory)
Documentation
newtype Span (~>) x y z
Constructors
Span
runSpan :: (y ~> x, y ~> z)
newtype Cospan (~>) x y z
Constructors
Cospan
runCospan :: (x ~> y, z ~> y)
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