inclusion in a set
61Galois connection — In mathematics, especially in order theory, a Galois connection is a particular correspondence between two partially ordered sets (posets). Galois connections generalize the correspondence between subgroups and subfields investigated in Galois… …
62Algebra of sets — The algebra of sets develops and describes the basic properties and laws of sets, the set theoretic operations of union, intersection, and complementation and the relations of set equality and set inclusion. It also provides systematic procedures …
63encyclopaedia — Reference work that contains information on all branches of knowledge or that treats a particular branch of knowledge comprehensively. It is self contained and explains subjects in greater detail than a dictionary. It differs from an almanac in… …
64Limit superior and limit inferior — In mathematics, the limit inferior (also called infimum limit, liminf, inferior limit, lower limit, or inner limit) and limit superior (also called supremum limit, limsup, superior limit, upper limit, or outer limit) of a sequence can be thought… …
65Concept-oriented model — Example of a concept oriented model. The concept oriented model (COM) is a data model based on the following three principles: Duality principle postulates that any element consists of two parts, called identity and entity. Accordingly, data… …
66Lemme de Zorn — En mathématiques, le lemme de Zorn (ou théorème de Zorn, ou parfois lemme de Kuratowski Zorn), est un théorème de la théorie des ensembles qui affirme que si un ensemble ordonné est tel que toute chaîne (sous ensemble totalement ordonné) possède… …
67Sheaf (mathematics) — This article is about sheaves on topological spaces. For sheaves on a site see Grothendieck topology and Topos. In mathematics, a sheaf is a tool for systematically tracking locally defined data attached to the open sets of a topological space.… …
68Lemme De Zorn — En mathématiques, Le lemme de Zorn (ou théorème de Zorn, ou parfois lemme de Kuratowski Zorn), est un théorème de la théorie des ensembles qui affirme qu un ensemble ordonné tel que toute chaîne (sous ensemble totalement ordonné) possède un… …
69Lemme de zorn — En mathématiques, Le lemme de Zorn (ou théorème de Zorn, ou parfois lemme de Kuratowski Zorn), est un théorème de la théorie des ensembles qui affirme qu un ensemble ordonné tel que toute chaîne (sous ensemble totalement ordonné) possède un… …
70Subset — In mathematics, especially in set theory, a set A is a subset of a set B if A is contained inside B . Notice that A and B may coincide. The relationship of one set being a subset of another is called inclusion.DefinitionsIf A and B are sets and… …
