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2. Relational algebra - Wikipedia

   en.wikipedia.org/wiki/Relational_algebra

   The relational algebra uses set union, set difference, and Cartesian product from set theory, and adds additional constraints to these operators to create new ones.. For set union and set difference, the two relations involved must be union-compatible—that is, the two relations must have the same set of attributes.

3. Category:Mathematical relations - Wikipedia

   en.wikipedia.org/wiki/Category:Mathematical...

   Download as PDF; Printable version; ... Relational algebra (10 P) Pages in category "Mathematical relations" ... By using this site, ...

4. Category:Relational algebra - Wikipedia

   en.wikipedia.org/wiki/Category:Relational_algebra

   Download QR code; Print/export Download as PDF; Printable version; In other projects Wikimedia Commons; Wikidata item; ... Pages in category "Relational algebra"

5. Relation algebra - Wikipedia

   en.wikipedia.org/wiki/Relation_algebra

   A relation algebra (L, ∧, ∨, −, 0, 1, •, I, ˘) is an algebraic structure equipped with the Boolean operations of conjunction x∧y, disjunction x∨y, and negation x −, the Boolean constants 0 and 1, the relational operations of composition x•y and converse x˘, and the relational constant I, such that these operations and constants satisfy certain equations constituting an ...

6. Composition of relations - Wikipedia

   en.wikipedia.org/wiki/Composition_of_relations

   Another form of composition of relations, which applies to general -place relations for , is the join operation of relational algebra. The usual composition of two binary relations as defined here can be obtained by taking their join, leading to a ternary relation, followed by a projection that removes the middle component.

7. List of algebras - Wikipedia

   en.wikipedia.org/wiki/List_of_algebras

   This is a list of possibly nonassociative algebras.An algebra is a module, wherein you can also multiply two module elements. (The multiplication in the module is compatible with multiplication-by-scalars from the base ring).

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9. Equivalence relation - Wikipedia

   en.wikipedia.org/wiki/Equivalence_relation

   In relational algebra, if and are relations, then the composite relation is defined so that if and only if there is a such that and . [ note 1 ] This definition is a generalisation of the definition of functional composition .