Page "Copenhagen interpretation" Paragraph 19
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All versions of the Copenhagen interpretation include at least a formal or methodological version of wave function collapse, in which unobserved eigenvalues are removed from further consideration.
( In other words, Copenhagenists have always made the assumption of collapse, even in the early days of quantum physics, in the way that adherents of the Many-worlds interpretation have not.
) In more prosaic terms, those who hold to the Copenhagen understanding are willing to say that a wave function involves the various probabilities that a given event will proceed to certain different outcomes.
But when one or another of those more-or less-likely outcomes becomes manifest the other probabilities cease to have any function in the real world.
So if an electron passes through a double slit apparatus there are various probabilities for where on the detection screen that individual electron will hit.
Many-worlds interpretations say that an electron hits wherever there is a possibility that it might hit, and that each of these hits occurs in a separate universe.
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