be a realistic point of view. Of course, quantum mechanics does
not allow that in this case. This is a point in which Bohm intro-
duces the word potential or potentiality. When a system has a
wave function which is not an eigenfunction of a given observable,
then it does not have a value for that observable. It has only
potentialities for having various values and when we make the
measurement of one of these quantities, the quantity in question,
one of these potentialities gets realized. This is, I think, the
just that way before Bohm wrote his book on quantum mechanics. I
think that this is probably the best statement of the quantum
mechanical view that we are venturing to call the orthodox view of
the subject, the view which I think probably most of us hold. But
like many orthodoxies, it is possible to hold to this orthodoxy
without ever having examined terribly closely just all that it
implies. Bohm, in his book, examined it far more closely than most
of us have.
says: I think that's a good way of putting it.
I think we should stop now for some coffee.
TUESDAY MORNING AFTER BREAK.
made a remark to me and I feel that everybody should hear it so
would you please say the same thing that you said to me? (he says
Professor Rosen referred to a book by Heisenberg in which he