Is the Identity of Indiscernibles flawed? Another way of looking at the issue is to ignore spatial location altogther. Imagine Max Black's two symmetric spheres and call them A1 and A2. Hide them in a box and pick two locations in space S1 and S2. You pick the spheres at random and place one at S1 and the other at S2. Would you be able to, just on the basis of spatial location (S1 and S2), tell which sphere is A1 and which sphere is A2? No! Ergo, space or spatial location has no relevance to identity. Since the two spheres A1 and A2 are identical in all other respects, it must be that A1 is identical to A2. — TheMadFool
I believe this leaves out the fact that they ARE in different locations. i'm not sure you can leave out that fact to claim they are identical but not the same. I could just as easily say "well that one is different because it's over there, and that one is different because it's over there. It's not important to know which one is S1 or S2 only that they are different from each other at that instance in time.
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Also for there to be no ability to discern who's a copy and whose the original wouldn't this :
3. x is a copy of y [neither 1 nor 2] if and only if x and y are indiscernible with respect to all attributes assignable to x and y except the attribute of spatial location at an instance of time. — TheMadFool
have to be this :
"x is a copy of y [neither 1 nor 2] if and only if x and y are indiscernible with respect to all attributes assignable to x and y except the attribute of spatial location at ANY instance of time."
It may be nitpicking, in which case, I apologize. But it seems without it we can claim all sorts of difference as any other time.
In anycase, I really enjoyed the 3 premises! It was very clear and insightful.