# Re: Modal logic, consciousness, and matter

```> On 26 Feb 2019, at 23:45, Philip Thrift <cloudver...@gmail.com> wrote:
>
>
>
> On Tuesday, February 26, 2019 at 4:39:25 PM UTC-6, Brent wrote:
>
>
> On 2/26/2019 2:02 PM, Philip Thrift wrote:
>>
>>
>> On Tuesday, February 26, 2019 at 2:51:39 PM UTC-6, Brent wrote:
>>
>>
>> On 2/26/2019 11:00 AM, Philip Thrift wrote:
>>>
>>>
>>> On Tuesday, February 26, 2019 at 12:43:49 PM UTC-6, Brent wrote:
>>>
>>>
>>> Right.  Truth and existence are quite different things.
>>>
>>> Brent
>>>
>>>
>>>
>>> For those from the type theory, programming language theory, constructive
>>> mathematics (whatever that clumping of schools is called):
>>>
>>> Truth and existence are the same things.
>>
>> So do those infer the existence of 2 and 4 from truth of 2+2=4?
>>
>> Brent
>>
>> Formulate arithmetic as a logic program and enter the query:
>>
>>    ∃(X,Y):(X+X=Y)
>>
>> Then via backtracking it prints out:
>>
>> (X,Y) =
>>
>> (0,0)
>> (1,2)
>> (2,4)
>> ...
>>
>>
> Formulate theology as a logic program and enter the query:
>
>   E(x)[If P is a prefection, then Px]
>
> Then it prints out:
>
> x = Anslem's God.
>
> That's the great thing about logic. You can prove anything if you just the
> right axioms and rules of inference.
>
> Brent
>
>
>
> Automating Godel’s Ontological Proof of God’s Existence with Higher-order
> Automated Theorem Provers
> http://page.mi.fu-berlin.de/cbenzmueller/papers/C40.pdf```
```
This illustrates only that we can “brainwash” machine, even machine which
reason in a valid way, by using absurd definitions or premise. That will not
convince Brent, I’m afraid. It is logically interesting though, and not
completely trivial, but hardly convincing as an argument of metaphysics. You
could as well say that infinity exists because ZF say so. It is not valid
argument. It is an argument per-authority, unless you make clear that you
assume the axioms of ZF.

Bruno

>
> - pt
>
>
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