Definition:Atomic WFF of Predicate Logic

Definition
An atomic WFF of predicate calculus is a WFF of the form:


 * Any propositional symbol of the alphabet of Propositional Calculus $\mathcal P_0$;


 * $p \left({u_1, u_2, \ldots, u_n}\right)$, where $u_1, u_2, \ldots, u_n$ are individual symbols, and $p \in \mathcal P_n$ is an $n$-ary predicate symbol.