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f(x_{0}, ...,x_{n-1}) :=T

- Introduction of new
`n`-ary function constant`f`(*definiendum*). `f`must not occur within term`T`(*definiens*).- Free variables of
`T`must be among`x`_{0}, ...,`x`_{n-1}. - New axiom
**forall**`x`_{0}, ...,`x`_{n-1}:`f`(`x`_{0}, ...,`x`_{n-1}) =`T`

*New function is uniquely characterized.*

Author: Wolfgang Schreiner

Last Modification: October 14, 1999