BmKnOFr, G., AND BARTEr, T.C. Modern Applied Algebra. McGraw-Hill, New York, 1970. Home/Search Document Not in Database Summary Related Articles |
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The Entity-Relationship Model--Toward a Unified View of Data - Peter Pin-Shan Chi (1976) (40 citations) (Correct)
....For example, an entity which belongs to the entity set MALEPERSON also belongs to the entry set PERSON. In this case, MALE PERSON is a subset of PERSON. 2.2.2 Relationship, Role, and Relationship Set. Consider associations among entities. A relationship set, Ri, is a mathematical relation [5] among n entities, ACM Transactions on Database Systems, Vol. 1, No. 1, March 1976. each taken from an entity set: Eel, e2, e, l e E E, e2 E E2, e, EI, and each tup]e of entities, e, e2 . e] is a relationship. Note that the El in the above definition may not be distinct. For ....
BmKnOFr, G., AND BARTEr, T.C. Modern Applied Algebra. McGraw-Hill, New York, 1970.
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