# Re: Movie Graph Argument: A Refutation

```On 04.01.2012 21:03 meekerdb said the following:
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```On 1/4/2012 10:55 AM, Evgenii Rudnyi wrote:
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```On 03.01.2012 21:42 meekerdb said the following:
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```On 1/3/2012 12:24 PM, Evgenii Rudnyi wrote:
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```On 02.01.2012 21:32 meekerdb said the following:
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```On 1/2/2012 12:24 PM, Evgenii Rudnyi wrote:
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```On 02.01.2012 07:01 meekerdb said the following:
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```
...

```
```Everett's MWI is based on QM which does assume a
background time and the state of the multiverse evolves
in Hilbert space. This evolution entails the evolution of
the state of different observers which are simultaneous.
```
```
Is an observer (or better many observers observing
simultaneously) is still necessary also by Everett's MWI?
What equation then describes an observer?
```
```
No. "Observer" is just shorthand for an interacting system
that "collapses" the wave function, i.e. couples the thing
observed into the quasi-classical environment. The
observation is the mathematical step of tracing over the
environmental degrees of freedom. So, within physics, there's
an equation describing observation.

```
```
Will the wave function collapse if we solve just the
SchrÃ¶diner equation?
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```
No.
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```
Does this concern both, normal and MWI? If yes, then what MWI
actually solves?
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In the MW interpretation there is no collapse, but there is a split
into (almost) orthogonal "worlds" or each person splits into
orthogonal "minds". These are just projections onto different
quasi-classical subspaces corresponding to different measurement
values. The projection is a mathematical, not a physical, operation.
```
```
Thanks a lot. I think I have got it now.

Evgenii

```
```Brent

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```
Evgenii

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```Brent

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