Quote by bloby
And how does this eigenstate evolve until the next measure?

Does it go back to being a set of possible states again? This is really stretching my grasp of this concept. Like I said, I've never actually seen "wavefunction collapse" in my textbook, only wikipedia....
Obviously you are trying to get at something here. Could you show me how this relates to my question? I need a concrete hint to go on. So far I have been thinking about this for days and I can't figure it out.
EDIT: If I get the same measurement for A each time, does it mean that [itex]\hat{A}\Psi = a\Psi[/itex] has only one possible eigenstate?
EDIT 2: It would be helpful also if someone could give me a large enough hint so that I could actually try to solve the problem on my own rather than short posts with long stretches in between where I am no closer to an answer.... not trying to be rude, I'm just very anxious and frustrated with this "simple" question.