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A multiplicative normal functor is a power functor - MaRDI portal

A multiplicative normal functor is a power functor (Q578639)

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scientific article; zbMATH DE number 4013502
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A multiplicative normal functor is a power functor
scientific article; zbMATH DE number 4013502

    Statements

    A multiplicative normal functor is a power functor (English)
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    1987
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    Let Comp be the category of compact spaces and continuous mappings. A functor F: Comp\(\to Comp\) is called normal if F is continuous and preserves weights, monomorphisms, epimorphisms, intersections, preimages, singletons and the empty set. It is proved that a normal functor F is the ith power functor for some natural number i whenever F preserves either finite products or absolute retracts. If CG is the category of compact separable topological groups and continuous homomorphisms with the natural forgetful functor U: CG\(\to Comp\) then for a normal functor F: Comp\(\to Comp\) there exists a functor G: CG\(\to CG\) with \(U\circ G=F\circ U\) if and only if F is the ith power functor for some natural number i.
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    topological group
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    endofunctor
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    preservation of properties
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    category of compact spaces
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    normal functor
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    finite products
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    absolute retracts
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    ith power functor
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