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Inverse View
It is not the case that The correlation between concepts and extensions established by Basic Law V must be a function — no concept gets correlated with two distinct extensions.
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Reasons For
2 perspectives
Reason for 1 of 2
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1.
Basic Law V is inconsistent (Russell's paradox), so any functional property derived solely from it inherits this inconsistency and cannot be asserted as a genuine logical truth.
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2.
A principle that entails contradiction does not establish a well-defined mapping; it establishes no mapping at all, making the claim vacuously grounded.
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Reason for 2 of 2
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1.
On an intensional conception of concepts (Frege's own Begriffe), distinct concepts with identical extensions remain distinct objects, leaving the direction of correlation from concept to extension under-determined.
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2.
If multiple co-extensive concepts are candidates for a single extension, the Va direction alone does not rule out a non-functional one-to-many correlation at the level of senses rather than references.
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Reasons Against
1 perspective
Reason against
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1.
Basic Law V asserts (via its Va direction) that if the extensions of F and G differ (εF ≠ εG), then F ≠ G.
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2.
The material equivalence of F and G (∀x(Fx ≡ Gx)) is a necessary condition for F = G, meaning ¬∀x(Fx ≡ Gx) implies F ≠ G.
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3.
A mapping is a function if and only if no input is correlated with two distinct outputs.
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