1.

Consider the first order predicate formula ϕ:∀x [(∀z z|x ⇒ ((z = x) ∨ (z = 1))) ⇒ ∃w (w > x) ∧ (∀z z|w ⇒ ((w = z) ∨ (z = 1)))]Here ‘a|b’ denotes that ‘a divides b’, where a and b are integers. Consider the followingsets:S1. {1,2,3, ... , 100}S2. Set of all positive integersS3. Set of all integersWhich of the above sets satisfy φ?

A. S1 and S2
B. S1 and S3
C. S2 and S3
D. S1, S2 and S3
Answer» D. S1, S2 and S3


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