# Formal Definition

A Formal Definition is a Concept Definition in the form of a Formal Specification.

**AKA:**Formal Concept Definition.**Context:**- It can be a Mathematical Definition.
- It can be an Intensional Definition or an Extensional Definition.
- …

**Example(s):**`(forall (f s1 s2) (if (function0 f s1 s2)(domain s1 f)))`

, a Formal Sentence from a Function Domain.- Let
*B1*, ...,*Bn*and [math]D[/math] be sets that are not necessarily Distinct Sets. A function F()*is a mapping of each Element combination [math]B[/math] to an element of*D*.*

**See:**Formal, Formal Sentence