| __Binary function -- Facts, Info, and Encyclopedia article__ *(Site not responding. Last check: 2007-10-23)* |

| | Alternatively, a **binary** **function** may be interpreted as simply a (A mathematical relation such that each element of one set is associated with at least one element of another set) **function** from X × Y to Z. |

| | A (An operation that follows the rules of boolean algebra; each operand and the result take one of two values) **binary** operation is a **binary** **function** where the sets X, Y, and Z are all equal; **binary** operations are often used to define (Click link for more info and facts about algebraic structure) algebraic structures. |

| | The concept of **binary** **function** generalises to ternary (or 3-ary) **function**, quaternary (or 4-ary) **function**, or more generally to n-ary **function** for any (The number 1 and any other number obtained by adding 1 to it repeatedly) natural number n. |

| www.absoluteastronomy.com /encyclopedia/b/bi/binary_function.htm (738 words) |