> On 25 Aug 2019, at 07:55, 'Brent Meeker' via Everything List 
> <[email protected]> wrote:
> 
> 
> 
> On 8/24/2019 8:01 PM, Russell Standish wrote:
>> On Sat, Aug 24, 2019 at 07:34:26PM -0700, 'Brent Meeker' via Everything List 
>> wrote:
>>> 
>>> On 8/24/2019 6:31 PM, Russell Standish wrote:
>>>> On Sun, Aug 25, 2019 at 10:06:38AM +1000, Bruce Kellett wrote:
>>>>> On Sun, Aug 25, 2019 at 9:45 AM Russell Standish <[email protected]> 
>>>>> wrote:
>>>>> 
>>>>>      On Sat, Aug 24, 2019 at 05:18:47PM -0400, John Clark wrote:
>>>>>      >
>>>>>      >     >> OK so 0=1, that's fine.
>>>>>      >
>>>>>      >     > No, that is not fine. If 0=1, pigs have wings.
>>>>>      >
>>>>>      >
>>>>>      > Yes but that's OK too, if nothing physical exists then pigs and 
>>>>> wings
>>>>>      can't
>>>>>      > cause problems because they don't exist. And there are no minds 
>>>>> that
>>>>>      might be
>>>>>      > upset by paradoxes.
>>>>>      >
>>>>> 
>>>>>      That's kind of the point, though. Minds are nonphysical things, and
>>>>>      there is no apriori reason why physical things need to exist for 
>>>>> minds
>>>>>      to exist.
>>>>> 
>>>>> 
>>>>> You have evidence for disembodied minds?
>>>> That's not an apriori reason. Assuming you're in principle OK with the
>>>> concept of a brain in a vat (which is a disembodied mind), then the
>>>> you too do not have an apriori reason for the existence of physical
>>>> things.
>>>> 
>>>> 
>>> I don't see that a brain in a vat counts as a disembodied mind.  Do you mean
>>> a brain that has no environment to perceive or act on?  I would deny that
>>> such an isolated brain instantiates a mind.  On the other hand, if the brain
>>> has sensors and actuators operating, say a Mars Rover, then it isn't
>>> disembodied.
>>> 
>>> Brent
>>> 
>> Yes - I know your argument. In the BIV scenario, the environment could
>> be simulated. Basically Descartes' evil daemon (malin genie)
>> scenario. Nothing about the observed physics (bodies and whatnot)
>> exists in any fundamental sense.
> But then "fundamental" loses it's meaning.   The BIV+Enviroment in the vat  
> constitutes a world.  The "fact" that it is implemented in some other world 
> becomes just magic talk, like the world exists in the mind of God.


OK, but then God does not need to be more than a tiny segment of the 
arithmetical reality, and this is already used by all scientists.

The fact is that all computation are implemented in all Turing universal 
machinery, like the tiny sigma_1 arithmetical reality.

Bruno



> 
> Brent
> 
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