## Finite Math and Applied Calculus (6th Edition)

The Cartesian product of two sets, $A$ and $B$, The set of all ordered pairs $(a,b)$ with $a\in A$ and $b\in B$: A$\times B=\{(a, b)|a\in$A and $b\in B\}$ The cardinal number of such a set is $\mathrm{n}(\mathrm{A})\cdot n(B)$ ( a product ) giving the idea the idea for Cartesian PRODUCT . (Also, "Cartesian" is in the honor of Rene Descartes, a pioneer in algebraic (analytical) geometry)