Proof by Resolution:(3) Resolve

P1: ~C(x) v S(x)

P2: A(y) v D(y) variables are standardized apart.

P3: ~A(z) v C(z)

P4: ~S(a)

P5: ~D(a)

P6: A(a) P2, P5 { a/y }

P7: C(a) P3, P6 { a/z }

P8: S(a) P1, P7 { a/x }

P9: [] P4, P8 { }

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