842 B
842 B
title
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| Cross Product |
Cross Product
In set theory, a cross product of two sets is a binary operation performed on sets, which outputs a result set. It is denoted by the symbol X. Sometimes it is also called as Cartesian Product after mathematician Rene Descartes. Each element of A is paired with each element of B.
A X B = {(a, b) | a ∈ A and b ∈ B}
Examples
let us have,
set A = {a, b}
& set B = {1, 2}
then A X B = {(a, 1), (a, 2),
(b, 1), (b, 2)}
Use
It is used to generate all possible combinations after combining two tables in a database.