# Re: What are wavefunctions?

```On 12/28/2013 4:45 PM, Jason Resch wrote:
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```

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On Sat, Dec 28, 2013 at 7:12 PM, meekerdb <meeke...@verizon.net <mailto:meeke...@verizon.net>> wrote:
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On 12/27/2013 10:31 PM, Jason Resch wrote:
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To that I would add the purely epistemic "non-intepretation" of Peres
and Fuchs.

"No interpretation needed" -- I can interpret this in two ways, one way is
to just
take the math and equations literally (this leads to Everett), the other is
"shut
up and calculate", which leads no where really.

```
```            2. Determined by which observer? The cat is always either dead or
alive.
It's just a matter of someone making a measurement to find out.

So are you saying that before the measurement the cat is neither alive
nor
you,
(and I think you are), saying that the cat is always definitely alive or
state
of being decayed and not decayed? If you say no, it sounds like you are
denying the reality of the superposition, which some interpretations
do, but
then this leads to difficulties explaining how quantum computers work
(which
require the superposition to exist).
```
```
Superposition is just a question of basis.  An eigenstate in one basis
is a
superposition in another.

Can you provide a concrete example where some system can simultaneously be
considered to be both in a superposition and not?  Is this like the
superposition
having collapsed for Wigner's friend while remaining for Wigner before he
enters
the room?

```
```
?? Every pure state can be written as a superposition of a complete set of
basis
states - that's just Hilbert space math.

So then when is the system not in a superposition?
```
```
When it's an incoherent mixture of pure states.

Brent

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