Reply: This is per good objection. However, the difference between first-order and higher-order relations is relevant here. Traditionally, similarity relations such as interrogativo and y are the same color have been represented, per the way indicated per the objection, as higher-order relations involving identities between higher order objects (properties). Yet this treatment may not be inevitable. Con Deutsch (1997), an attempt is made onesto treat similarity relations of the form ‘\(x\) and \(y\) are the same \(F\)’ (where \(F\) is adjectival) as primitive, first-order, purely logical relations (see also Williamson 1988). If successful, a first-order treatment of similarity would esibizione that the impression that identity is prior preciso equivalence is merely verso misimpression — coppia sicuro the assumption that the usual higher-order account of similarity relations is the only option.
Objection 6: If on day 3, \(c’ = s_2\), as the text asserts, then by NI, the same is true on day 2. But the text also asserts that on day 2, \(c = s_2\); yet \(c \ne c’\). This is incoherent.
Objection 7: The notion of incomplete identity is incoherent: “If verso cat and one of its proper parts are one and the same cat, what is the mass of that one cat?” (Burke 1994)
Reply: Young Oscar and Old Oscar are the same dog, but it makes no sense sicuro ask: “What is the mass of that one dog.” Given the possibility of change, identical objects may differ durante mass. On the imparfaite identity account, that means that distinct logical objects that are the same \(F\) may differ mediante mass — and may differ with respect puro verso host of other properties as well. Oscar and Oscar-minus are distinct physical objects, and therefore distinct logical objects. Distinct physical objects may differ durante mass.
Objection 8: We can solve the paradox of 101 Dalmatians by appeal to per notion of “almost identity” (Lewis 1993). We can admit, per light of the “problem of the many” (Unger 1980), that the 101 dog parts are dogs, but we can also affirm that the 101 dogs are not many; for they are “almost one.” Almost-identity is not per relation of indiscernibility, since it is not transitive, and so it differs from correspondante identity. It is per matter of negligible difference. Verso series of negligible differences can add up esatto one that is not negligible.
Let \(E\) be an equivalence relation defined on verso set \(A\). For \(x\) sopra \(A\), \([x]\) is the servizio of all \(y\) mediante \(A\) such that \(E(incognita, y)\); this is the equivalence class of interrogativo determined by Di nuovo. The equivalence relation \(E\) divides the arnesi \(A\) into mutually exclusive equivalence classes whose union is \(A\). The family of such equivalence classes is called ‘the partition of \(A\) induced by \(E\)’.
3. Divisee Identity
Garantit that \(L’\) is some fragment of \(L\) containing a subset of the predicate symbols of \(L\) and the identity symbol. Let \(M\) be per structure for \(L’\) and suppose that some identity statement \(verso = b\) (where \(a\) and \(b\) are individual constants) is true per \(M\), and that Ref and LL are true mediante \(M\). Now expand \(M\) puro verso structure \(M’\) for per richer language — perhaps \(L\) itself. That is, garantis we add some predicates to \(L’\) and interpret them as usual durante \(M\) puro obtain an expansion \(M’\) of \(M\). Endosse that Ref and LL are true durante \(M’\) and that the interpretation of the terms \(a\) and \(b\) remains the same. Is \(per = b\) true sopra \(M’\)? That depends. If the identity symbol is treated as per logical constant, the answer is “yes.” But if it is treated as a non-logical symbol, incontri flirtwith then it can happen that \(a = b\) is false sopra \(M’\). The indiscernibility relation defined by the identity symbol mediante \(M\) may differ from the one it defines mediante \(M’\); and per particular, the latter may be more “fine-grained” than the former. Durante this sense, if identity is treated as per logical constant, identity is not “language correlative;” whereas if identity is treated as a non-logical notion, it \(is\) language incomplete. For this reason we can say that, treated as per logical constant, identity is ‘unrestricted’. For example, let \(L’\) be a fragment of \(L\) containing only the identity symbol and a single one-place predicate symbol; and suppose that the identity symbol is treated as non-logical. The formula
4.6 Church’s Paradox
That is hard onesto say. Geach sets up two strawman candidates for absolute identity, one at the beginning of his conciliabule and one at the end, and he easily disposes of both. Per between he develops an interesting and influential argument preciso the effect that identity, even as formalized per the system FOL\(^=\), is correlative identity. However, Geach takes himself to have shown, by this argument, that absolute identity does not exist. At the end of his initial presentation of the argument sopra his 1967 paper, Geach remarks:




Май 14th, 2023
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