Both options allow one to switch v(f(Q)) in and out of existence, or switch between v(f(Q)) and v′(f(Q)), merely by switching between P- and Q-measurement situations on a prepared system.
(as used in quantum mechanics and philosophy of physics)
An object or particle that has been set up in a specific initial state or condition before you perform an experiment on it.
Switch in and out of existence(as used in quantum mechanics interpretations and metaphysics)
The philosophical idea that something can be made to exist or cease to exist depending on what conditions or measurements you apply.
v(f(Q))(as used in quantum mechanics and formal philosophy)
A mathematical notation representing the value or result you get when you apply a function (f) to a measurement or property (Q). Think of it like plugging a number into a formula to get an answer.
v′(f(Q))(as used in quantum mechanics and formal philosophy)
A different version or alternative result of the same calculation, marked with a prime symbol (′) to show it's distinct from the first one.
(a) We might think that v(f(Q)) just is not a self-sustained physical property, but one which ontologically depends on the presence of another property v(Q). (Recall that in the proof of FUNC v(f(Q)) is constructed from v(Q).) But, since the position does not reject questions about values of f(Q) in a P-measurement situation as illegitimate (because it does not trade on a notion of an observable being well-defined in one context only!), this seems to lead to new and pressing questions, to say t