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Well, the associated eigenspace of L with eigenvalue +1 is the entire space of possible linear superpositions of straight-line tracks...

Turns out L should be consistent with those more mundane measurement operators. They should be a simple refinement of L. (I have no...

The observation is just the eigenvalue and its associated eigenspace. Even so there is a state after measurement, I don't always learn...

Because he cares about the state of the cloud chamber, i.e. the state of the measurement apparatus. And if the possible dots constitue...

No, I tried to guess what you might have in mind when you claimed: "I said it (quite strongly) leads to the opposite prediction, that we...

Exactly!

Good, but then I simply disagree with you on that point. I mean, as a proponent of the consistent histories interpretation, I wonder...

Let me expand on this, because there's a seemingly obvious response that Coleman gives a little later in the lecture, using David...

Yeah, after my reply to Demystfier #48, I also became unsure. If his argument should be too weak to explain why we see a single...

Not for Coleman. For him, the relevant Hilbert space is that of the dots. For Coleman, there are states ##|none\rangle## and...

In the given setup, L is the measurement operator. So you don't observe indiviual atoms at all. You just observe L. And in the simple...

Note that Coleman's operator L operates on the state of the cloud chamber |C⟩, not on the initial or scattered particle. L looks at the...

Yes. And if Demystifier agrees that his Hilbert space should have been (at least) 4 dimensional instead of 2 dimensional, then his...

Let us first agree on Demystifier's example. He thinks it generalizes to more complicated scenarios. And what Coleman says on page 10 is...

Let us look at the 4-dimensional Hilbert space for Demystifier's simplified scenario. On L is defined on the "corresponding" basis via L...