Which are not predicate logic sentences?
A. (x)Fx ⊃ Ga
B. (x)Fx ⊃ (∃y)Gxy
C. ~ (∃y) Fy ⊃ (x)Gx
D. (x)(Fx ⊃ Ga)
I'm pretty sure C is a sentence as its well formed...Is D a sentence?
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If (x)Fx is a wff, and Ga is a wff, then only B is not a wff; it would require parentheses around the conditional, no?