Database Architecture and Design
The Concept of a Set
Let us use the following (paraphrased) informal definition of a set [2STOLL]:
A set S is any collection of definite, distinguishable objects - real or imagined - to be conceived as a whole. The objects are called the elements or members of the set.
Note the word distinguishable - it is of the first order of importance. For those of you who know the meaning of the word null, or the phrase primary key it should strike an immediate chord.
The following are observations that relate back to first principles:
[1STOLL] Stoll, Robert, Page 2 Set theory and Logic
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Updated January 27, 2005