FOM: Alice, Carol and Leibniz

Kanovei kanovei at
Tue Apr 16 07:10:49 EDT 2002

>Date: Mon, 15 Apr 2002 14:19:09 -0500
>From: "Miguel A. Lerma" <mlerma at>

> then look 
> at them again, you may still see one electron in the NW corner
> and another one in the SE corner, but you will be unable to 
> determine whether the electron in the NW corner is the same
> electron that was in the NW corner before or is the one that 
> was in the SE corner.

Between the observations, the two electrons just do not 
exist as such, what exists is a sort of probability distribution, 
that they speak about "two electrons" is just a mathematical 
abstraction which does not imply that there are two 
physically existing things of any kind whether distinguishable 
or not. 
It is physically meaningless to ask whether the electron 
in the SE corner is the same as the SE electron of the 
earlier observation, or, if you want, the answer 
can be formulated only in terms YES with 0.77 probability 
NO with 0.23 probability, which also reflects rather 
certain mathematical abstractions than physical entities. 

To conclude you cannot use the electrons between the observations 
to count anything, while in the moment of observation you can 
use them to count but they are well distinguishable in NW/SE 


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