Ghosts and Mind Copies - The Identity Question

[jeff_wilson]

Originally Posted by whswhs

That's one of the basic fallacies of twentieth century philosophy. "Relative" is not equivalent to "subjective."

It's also not equivalent to "objective", involving additional considerations to establish that. The other poster seemed to be taking it beyond that, in saying any variation in observation was sufficient to disprove identity, paradoxically presuming identical observers.

Originally Posted by whswhs

And finally, from relative measurements, it is possible to determine measurements that are true in any reference frame, or invariants, such as rest mass, which are not relative.

Isn't the numerical identity likewise an invariant?