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.

Keywords: entity, relationship, index cardinality, participation degree, structural constraints of kind (min, max).

ACM Classification Keywords: E.4 Coding and information theory – Formal models of communication

Link:

FORMALIZATION OF STRUCTURAL CONSTRAINTS OF RELATIONSHIPS IN MODEL „ENTITY-RELATIONSHIP”

Dmytro Buy, Lyudmila Silveystruk

http://www.foibg.com/ijita/vol14/ijita14-4-p07.pdf