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An entity–relationship model (or ER model) describes interrelated things of interest in a specific domain of knowledge. A basic ER model is composed of entity types (which classify the things of interest) and specifies relationships that can exist between entities (instances of those entity types).
In systems analysis, a one-to-many relationship is a type of cardinality that refers to the relationship between two entities (see also entity–relationship model). For example, take a car and an owner of the car. The car can only be owned by one owner at a time or not owned at all, and an owner could own zero, one, or multiple cars.
The ER model is the basis for IBM's Repository Manager/MVS and DEC's CDD/Plus. Chen's original paper [3] is commonly cited as the definitive reference for entity relationship modeling though the concept of object relationship had been developed a year earlier by Schmid and Swenson as reported in the 1975 ACM SIGMOD Proceedings . Chen is one of ...
Social Security benefits are, for most people, designed to replace about 40% of average wages. Since some people earn millions of dollars per year, it's clear the maximum benefit doesn't come ...
The State Department said an American teacher arrested in Russian on drug charges in 2021 has been designated by the U.S. government as wrongfully detained.
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Diorama of Mission San Diego de Alcalá made by a California elementary school student. The California mission project is an assignment done in California elementary schools, most often in the fourth grade, where students build dioramas of one of the 21 Spanish missions in California.
For a graph G, let χ(G) denote the chromatic number and Δ(G) the maximum degree of G.The list coloring number ch(G) satisfies the following properties.. ch(G) ≥ χ(G).A k-list-colorable graph must in particular have a list coloring when every vertex is assigned the same list of k colors, which corresponds to a usual k-coloring.