In mathematics, a subcategory of a category C is a category S whose objects are objects in C and whose morphisms are morphisms in C with the same identities and composition of morphisms. Intuitively, a subcategory of C is a category obtained from C by `removing` some of its objects and arrows. ==Formal definition== Let C be a category. A subcate.....
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http://en.wikipedia.org/wiki/Subcategory
a subordinate category or a division of a category.
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https://www.infoplease.com/dictionary/subcategory
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