License	BSD-style (see the file LICENSE)
Maintainer	sjoerd@w3future.com
Stability	experimental
Portability	non-portable
Safe Haskell	None
Language	Haskell2010

Data.Category.Comma

Description

Comma categories.

Documentation

data CommaO :: * -> * -> * -> * where Source #

Constructors

CommaO :: (Cod t ~ k, Cod s ~ k) => Obj (Dom t) a -> k (t :% a) (s :% b) -> Obj (Dom s) b -> CommaO t s (a, b)

data (:/\:) :: * -> * -> * -> * -> * where Source #

Constructors

CommaA :: CommaO t s (a, b) -> Dom t a a' -> Dom s b b' -> CommaO t s (a', b') -> (t :/\: s) (a, b) (a', b')

Instances

(Category (Dom t), Category (Dom s)) => Category (t :/\: s) Source #	The comma category T \downarrow S
Instance details Defined in Data.Category.Comma Methods src :: (t :/\: s) a b -> Obj (t :/\: s) a Source # tgt :: (t :/\: s) a b -> Obj (t :/\: s) b Source # (.) :: (t :/\: s) b c -> (t :/\: s) a b -> (t :/\: s) a c Source #

commaId :: CommaO t s (a, b) -> Obj (t :/\: s) (a, b) Source #