Proceedings of the International School of Physics "Enrico Fermi"
Course II, edited by B. d'Espagnat, 29 June - 11 July 1970,
Academic Press 1971.

wigner
	Wigner likes to keep position as fundamental in Newtonian
physics rather than position and velocity.  It seems to me that
it is not much more of a commitment to take them both as fundamental
and related than to take only position.  Perhaps the idea is that
if we take only position, then position as a function of time can
be taken as a kind of independent variable, but it seems to me that
we should be ready, at the drop of a hat, to give up the mutual
independence of the numerical quantities used to describe physical
states.

	This note isn't especially about Wigner's paper.  In the
Bohr interpretation, the observer is fundamental, but the observer
can often be taken to be the apparatus.  Some say that the wave
function should include the apparatus, however complicated and
however delayed its giving its answers, and this wave function
collapses only when a human looks at the printout.  But this suggests
including the human in the wave function and discussing i.e. amplitudes, corresponding to reading the printout and yelling
"Eureka" or not depending on whether the experimenter likes the
results.

	Back to Wigner.  More is known about the consequences of
unitarity than I thought.  Maybe I should take another look at
the von Neumann book.  

	In so far as I understand it, I prefer the Everett interpretation
of quantum mechanics as described by Witt.