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Inverse View
It is not the case that Kant demonstrated that existence is not a predicate that adds to a concept's content, but merely posits the concept as instantiated.
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Reasons For
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Reason for
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1.
Distinguishing 'positing as instantiated' from ordinary predication merely relocates the problem without solving it—positing is itself a relation requiring explanation.
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2.
Properties like 'being spatiotemporal' or 'being causally efficacious' seem to be genuine predicates that existence-claims necessarily involve.
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3.
Frege's logic can accommodate existence as a quantifier without Kant's distinction, making his thesis metaphysically unnecessary for modern philosophy.
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Reasons Against
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Reason against
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1.
Adding 'exists' to a concept's definition doesn't change what the concept means—a 'real hundred dollars' has the same properties as an 'imagined hundred dollars'.
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2.
Positing instantiation avoids the regress problem: we don't need to define existence itself or ask what 'existing' predicate means.
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3.
Ontological arguments fail only if existence is not a predicate, making Kant's view necessary to reject proofs that God must exist conceptually.
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