Bracketing concerns about a notion of indeterminacy whose source is not semantic (nor epistemic) and about the notion of indeterminate truth, we devoted part of the discussion to Cameron’s contention that insatisfaction with “Lucretian” properties like being such as to have been a child motivates restriction to difference-making properties as candidates for truthmaking, understood as properties “the instantiation of which at a time makes a difference to the intrinsic nature of the bearer at that time”.
If I understood them correctly, both Marta Campdelacreu (in attendance) and Pablo Rychter (virtually) independently worried that some properties that would count as difference-making for Cameron seemed insatisfactory for truthmaking in just the same way than “Lucretian” properties were. Take an intrinsic property Ross presently instantiates, say being currently sitting. It would seem as unsatisfactory as before that the presentist used the property of being such as to have been a child and currently sitting in the truthmaker for the truth that Ross was a child. But the property is difference-making for him, given that
(*) Ross has the intrinsic nature at the present that he has partly in virtue of instantiating being such as to have been a child and currently sitting at the present.(Notice that it won’t do, it seems to me, to reject (*) on the basis of:
(#) Ross has the intrinsic nature at the present that he has partly in virtue of instantiating being currently sitting at the present.For, arguably, if (#) is true then (*) is also true. See the axiom of subsumption in Fine’s (1995) logic of essence, and the discussion of the conjunction thesis for truthmaking in López de Sa (2009).)