In which of the following is the variable "x" free?

A. (?x)Fx • Gy
B. (?x)(y)(Gy ? Fx)
C. (x)((Fx • Gx) ? Hx)
D. Fx • (x)(Gx ? Hx)


D. Fx • (x)(Gx ? Hx)

Philosophy & Belief

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