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Title: Formalization of Structural Constraints of Relationships in Model „Entity-Relationship”
Authors: Buy, Dmytro
Silveystruk, Lyudmila
Keywords: Entity
Index Cardinality
Participation Degree
Structural Constraints of Kind (Min, Max)
Issue Date: 2007
Publisher: Institute of Information Theories and Applications FOI ITHEA
Abstract: The basic conceptions of the model „entity-relationship” as entities, relationships, structural constraints of the relationships (index cardinality, participation degree, and structural constraints of kind (min, max)) are considered and formalized in terms of relations theory. For the binary relations two operators (min and max) are introduced; structural constraints are determined in terms of the operators; the main theorem about compatibility of these operators’ values on the source relation and inversion to it is given here.
ISSN: 1313-0463
Appears in Collections:Volume 14 Number 4

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