Discussion
The correct symbolization of the following proposition is :
Statement : Authors and poets are intelligent and successful.
Answer: D
The correct symbolization is (x)[(Ax ∨ Px) ⊃ (Ix . Sx)].
'Authors and poets are intelligent and successful' says that anyone who is an author, and anyone who is a poet, is both intelligent and successful. So the condition is a disjunction: for every x, if x is an author or x is a poet, then x is intelligent and x is successful.
Using Ax . Px in the antecedent (options A and B) would restrict the claim to people who are both authors and poets. Option B also weakens the predicate to 'intelligent or successful', and option C, with a dot in place of the horseshoe, claims that everything is an author, a poet, intelligent and successful.
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