A DESCRIPTION OF ITERATIVE REFLECTIONS OF MONADS
A DESCRIPTION OF ITERATIVE REFLECTIONS OF MONADS
复制标题
单子迭代反射的描述
DOI:
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发表时间:
2008
期刊:
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通讯作者:
J. Velebil
中科院分区:
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作者:
Stefan Milius;J. Velebil
For ideal monads in Set (e. g. the nite list monad, the nite bag monad etc.) we have recently proved that every set generates a free iterative algebra. This gives rise to a new monad. We prove now that this monad is iterative in the sense of Calvin Elgot, in fact, this is the iterative reection of the given ideal monad. This shows how to freely add unique solutions of recursive equations to a given algebraic theory. Examples: the monad of free commutative binary algebras has the monad of binary rational unordered trees as iterative reection, and the nite list monad has the iterative reection given by adding an absorbing element.