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・ Finsch's pygmy parrot
・ Finsch's rufous thrush
・ Finsch's wheatear
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・ Finschhafen District
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FinSet
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・ FINSIA
・ Finsing
・ Finska Kyrkogränd
・ Finsland
・ Finsler
・ Finsler manifold
・ Finsler–Hadwiger theorem
・ Finspot wrasse
・ Finspreads
・ Finspång
・ Finspång Castle
・ Finspång Municipality


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FinSet : ウィキペディア英語版
FinSet
In the mathematical field of category theory, FinSet is the category whose objects are all finite sets and whose morphisms are all functions between them. FinOrd is the category whose objects are all finite ordinal numbers and whose morphisms are all functions between them.
== Properties ==
FinSet is a full subcategory of Set, the category whose objects are all sets and whose morphisms are all functions. Like Set, FinSet is a large category.
FinOrd is a full subcategory of FinSet as by the standard definition, suggested by John von Neumann, each ordinal is the well-ordered set of all smaller ordinals. Unlike Set and FinSet, FinOrd is a small category.
FinOrd is a skeleton of FinSet. As such, FinSet and FinOrd are equivalent categories.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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