Definition:Classes of WFFs/Plain WFF
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Definition
A plain WFF of predicate logic is a WFF with no parameters.
Thus $\map {WFF} {\PP, \FF, \O}$ is the set of all plain WFFs with relation symbols from $\PP$ and function symbols from $\FF$.
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It is immediate that a plain WFF is a WFF with parameters from $\KK$ for all choices of $\KK$.
Sources
- 1996: H. Jerome Keisler and Joel Robbin: Mathematical Logic and Computability: $\S 2.3$