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Inverse View
It is not the case that The formula x = a ∨ x = b implicitly quantifies over the totality of sets to isolate {a,b}, making its use in P4 viciously circular on predicativist grounds.
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Reasons For
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Reason for
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1.
The disjunction x = a ∨ x = b is a finite, constructive definition requiring no quantification over infinite domains.
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2.
Predicativists permit impredicative operations on finite sets; circularity only arises with infinite totalities.
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3.
The formula defines {a,b} relative to a and b as given parameters, not by quantifying over all possible sets.
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Reasons Against
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Reason against
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1.
Predicativism requires that sets be definable without quantifying over larger domains containing the set itself.
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2.
The formula x = a ∨ x = b quantifies over all possible values of x to determine membership in {a,b}.
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3.
If {a,b} exists prior to this quantification, the quantifier presupposes the totality it purports to construct.
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