Murat Kasimov

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Я language (β)

/Я language (β)/Operators/yakl/

(`ya`) [Y]oneda functor mapping contr[A]variantly (`xk`) Source lax [K]leisli morphism (`xl`) Target lax K[L]eisli morphism
`yakl` : target ( t a ) ( target ( source ( o ) ( tt a ) ) ( tt ( t a ) )

Looks like a big circle `yi` with a bullet point `ha` inside designating contravariant position of a focused parameter equipped with a small hook `xk` designating source lax Kleisli morphism and a big hook `xl` designating target lax Kleisli morphism.

Original mapping of derived functor definition:

: source ( o ) ( tt a ) `AR____` target ( t a ) ( tt ( t o ) )

This operator is available for functors with multiple parameters:

`yaikl` : target ( t a _ ) ( target ( source ( o ) ( tt a ) ) ( t o _ ) )
`yiakl` : target ( t _ a ) ( target ( source ( o ) ( tt a ) ) ( t _ o ) )

Type declaration with labels arrangement:

`yakl` : target ( t a ) ( target ( source ( o ) ( tt `L` tt `T` ll `L` t `T` l `T` a ) ) ( t o ) )

Available stretched versions (starting precedence is 7):

`yakl_`, `yakl__`, `yakl___`, `yakl____`