# Category

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**Category Management**— Der Begriff Warengruppenmanagement oder auch Category Management bezeichnet im Marketing die Strukturierung einer Geschäftsstätte im stationären Einzelhandel nach dem Prinzip der Warengruppen. Diese werden mithilfe von Marktforschungs Analysen… …92

**Category theory**— In mathematics, category theory deals in an abstract way with mathematical structures and relationships between them: it abstracts from sets and functions to objects and morphisms . Categories now appear in most branches of mathematics and in… …93

**Category of rings**— In mathematics, the category of rings, denoted by Ring, is the category whose objects are rings (with identity) and whose morphisms are ring homomorphisms (preserving the identity). Like many categories in mathematics, the category of rings is… …94

**Category:Date of birth missing**— This is an administration category. It is used for administration of the Wikipedia project and is not part of the encyclopedia. It contains pages that are not articles, or it groups articles by status rather than content. Do not include this… …95

**Category:Date of birth unknown**— This category is not shown on its member pages, unless the appropriate user preference is set. This category (and within its own specific purpose, the analogous Category:Date of death unknown) is intended for placement in biographical entries… …96

**Category:Date of birth missing (living people)**— This category is not shown on its member pages, unless the appropriate user preference is set. When the year of birth for a living individual has been researched, but the month and day remain missing, please do not use Date of birth missing… …97

**Category:Date of death missing**— This category is not shown on its member pages, unless the appropriate user preference is set. This category is intended for use in biographical entries which indicate the individual s year of death, but not the month and day, due to lack of… …98

**Category:Date of death unknown**— This category is not shown on its member pages, unless the appropriate user preference is set. This category (and similarly Category:Date of birth unknown) is intended for articles about people, mainly historical, whose year of death is known,… …99

**Category B services**— A Category B service (formerly Category 2) is a Canadian specialty television channel which, as defined by the Canadian Radio television and Telecommunications Commission, may be carried, optionally, by all digital cable television and direct… …100

**Category of topological spaces**— In mathematics, the category of topological spaces, often denoted Top, is the category whose objects are topological spaces and whose morphisms are continuous maps. This is a category because the composition of two continuous maps is again… …