The observer makes the first measurement, and records it, and this alters the state of the particle.
The disturbance interpretation is kind of deprecated nowadays.
Well, you could look at Heisenberg's Uncertainty Princpiple: (o_x * o_p >= hbar / 2) and try to interpret what it means.
But I'm suggesting something else entirely.
Set that equation off to the side. And then building a model of measurement.
We don't have a model of measurement actually taking place, by Everett's standards. Computers have a little ways to go to a model that size. But we will, and in the meantime, any abstract thinker should be able to grok this.
In our models, we have relationships between measurable quantities. In Everett's model, the meas...
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