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Noun
1. category theoryMathematics
Wikipedia definition
2. Category theoryCategory theory is an area of study in mathematics that examines in an abstract way the properties of particular mathematical concepts, by formalising them as collections of objects and arrows (also called morphisms, although this term also has a specific, non category-theoretical sense), where these collections satisfy some basic conditions.
Read “Category theory” on English Wikipedia
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Read “Category theory” on DBpedia

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