Beck's monadicity theorem

In category theory, a branch of mathematics, Beck's monadicity theorem gives a criterion that characterises monadic functors, introduced by Jonathan Mock Beck in about 1964. It is often stated in dual form for comonads. It is sometimes called the Beck tripleability theorem because of the older term triple for a monad. Beck's monadicity theorem asserts that a functor is monadic if and only if There are several variations of Beck's theorem: if U has a left adjoint then any of the following conditions ensure that U is monadic:

Beck's monadicity theorem

In category theory, a branch of mathematics, Beck's monadicity theorem gives a criterion that characterises monadic functors, introduced by Jonathan Mock Beck in about 1964. It is often stated in dual form for comonads. It is sometimes called the Beck tripleability theorem because of the older term triple for a monad. Beck's monadicity theorem asserts that a functor is monadic if and only if There are several variations of Beck's theorem: if U has a left adjoint then any of the following conditions ensure that U is monadic: