Which of the following is not a condition for a symbolic expression to be a well-formed formula (WFF)?

A. If p is a WFF, then so is ~(p).
B. If p and q are WFFs, then so is (p • q).
C. If p and q are WFFs, then so is (p ? q).
D. If p and q are WFFs, then so is (p ? q).


A. If p is a WFF, then so is ~(p).

Philosophy & Belief

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