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p(x_{0}, ...,x_{n-1}) : <=>F

- Introduction of new
`n`-ary predicate constant`p`(*definiendum*). `p`must not occur within formula`F`(*definiens*).- Free variables of
`F`must be among`x`_{0}, ...,`x`_{n-1}. - New axiom
**forall**`x`_{0}, ...,`x`_{n-1}:`p`(`x`_{0}, ...,`x`_{n-1}) <=>`F`

*New predicate is uniquely characterized.*

Author: Wolfgang Schreiner

Last Modification: October 14, 1999