Set Theory


A set has several interpretation:

This section is about what's called the set theory (ie what rules and operations applied to a set of data).

Sets are one of the most fundamental concepts in mathematics. Developed at the end of the 19th century, set theory is now a ubiquitous part of mathematics, and can be used as a foundation from which nearly all of mathematics can be derived.


{ } are the standard notation for sets.


The most important application of set theory is the relational theory where a relation (ie a relational table, view) is:

And therefore all operations performed on a relation are also set operation.


Set operations are visualized with venn diagrams

Venn Diagram


Set Theory - Operator (Operations)

Cardinality (Size)

Set Theory - Cardinality (Finite/Infinite Size)

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