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Isomorphism-closed subcategory
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Isomorphism-closed subcategory : ウィキペディア英語版
Isomorphism-closed subcategory

In category theory, a branch of mathematics, a subcategory \mathcal of a category \mathcal is said to be isomorphism-closed or replete if every \mathcal-isomorphism h:A\to B with A\in\mathcal belongs to \mathcal. This implies that both B and h^:B\to A belong to \mathcal as well.
A subcategory which is isomorphism-closed and full is called strictly full. In the case of full subcategories it is sufficient to check that every \mathcal-object which is isomorphic to an \mathcal-object is also an \mathcal-object.
This condition is very natural. E.g. in the category of topological spaces one usually studies properties which are invariant under homeomorphisms – so called topological properties. Every topological property corresponds to a strictly full subcategory of \mathbf.
==References==


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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