Official definition of call-by-value (Re: Finding the instance reference...)

Robert Kern robert.kern at
Wed Nov 19 00:03:35 CET 2008

Terry Reedy wrote:
> Steven D'Aprano wrote:
>> On Sun, 16 Nov 2008 15:46:54 -0800, rurpy wrote:
>> For example, consider the two electrons around a helium nucleus. They 
>> have the same mass, the same speed, the same spin, the same electric 
>> charge, the same magnetic moment, they even have the same location in 
>> space (technically, the same wave function).
> By quantum mechanics (Pauli Exclusion principle), this is impossible.
>  > They are identical in every
>> possible way. Are they the same electron, or two different electrons? 
>> What does the question even mean?
> That you do not understand QM?
> Photons, on the other hand, can be identical, hence lasars.
> Matter is divided into leptons and bosons, individualists and 
> communalists.  (I believe I have the name right.)

Fermions and bosons, actually.

Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco

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