On 14 Sep 2017, at 14:39, ronaldheld wrote:
On Thursday, September 14, 2017 at 8:01:16 AM UTC-4, Bruno Marchal
wrote:
On 14 Sep 2017, at 13:22, ronaldheld wrote:
This should cause some discussion. Maybe belongs in the "is math
real" thread, but that one is large??
Ronald
What is your opinion?
The author believes that PI does not existed 100,000 years ago.
It looks like he believes that 100,000 existed 100,000 years ago,
making hard for me to understand why PI would not exist, and in
which sense, as PI is not a function of time.
Then the author seems to believe in a primary physical universe, and
does not seem aware that this is an assumption too, and indeed
arguably much stronger than assuming arithmetic.
The main problem is that the author does not put its assumption on
the table, and take for granted that existence is physical
existence. That does not make sense with mechanism (probably), but
to be franc, I am not sure this makes sense even without mechanism.
He confuses also mathematical theory and mathematical reality, it
seems.
What do *you* think? What would be your primary assumption?
My feeling is that it is a waste of time to guess what exists or not
before saying what we are willing to assume as primitively true, or
what is the metaphysical background accepted.
Bruno
--
You received this message because you are subscribed to the Google
Groups "Everything List" group.
To unsubscribe from this group and stop receiving emails from it,
send an email to [email protected].
To post to this group, send email to [email protected].
Visit this group at https://groups.google.com/group/everything-list.
For more options, visit https://groups.google.com/d/optout.
<1709.03087.pdf>
http://iridia.ulb.ac.be/~marchal/
Well, his use of 100000 years does not fit with some little things
he states. I am not the best person to comment, one because we
should get more opinions. AFAIK his view is that mathematics
(applied) does not fit the "real world" as well as others have
claimed. he also assumes that lesser animals cannot do any math
besides counting low integers.
He seem to believe that mathematical object does not exist physically,
and in that sense, I can agree. The platonists usually think something
very close, like the idea that there is no physical circle, and thus
no PI, "on earth". In the terrestrial plane, appearance of circles and
PI are mere approximation of the "divine PI in the sky, or in the mind
of God, or in the mind of mathematicians". The question is then about
the terrestrial plane: is it fundamentally real, or is it a delusion
due to the infinitely many "video-games" executed in arithmetic? The
question is never is this real or not, but is this fundamentally or
primarily real of not.
Now, I can understand an intuitionist doubting about discontinuous
function, or about non computable real number, but to say that PI does
not exist, without saying precisely what exists, does not make much
sense to me. Pure primary matter has never been observed, nor even
defined, nor even really used in physics or even in metaphysics
(except to stop thinking on the mind-body problem). So, most
conception of primary matter is already mathematicalist: primitive
matter is just what is denoted by the elementary terms of the theory
(string, particles, fields, ...), but all those notion presumes the
natural numbers, intuitionistically or classically. The paper here
seems to assume a physical reality, but never try to make that
precise, and so is poorly convincing, and a bit naive on the
fundamental issue, I would say.
Bruno
Ronald
--
You received this message because you are subscribed to the Google
Groups "Everything List" group.
To unsubscribe from this group and stop receiving emails from it,
send an email to [email protected].
To post to this group, send email to [email protected].
Visit this group at https://groups.google.com/group/everything-list.
For more options, visit https://groups.google.com/d/optout.
http://iridia.ulb.ac.be/~marchal/
--
You received this message because you are subscribed to the Google Groups
"Everything List" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at https://groups.google.com/group/everything-list.
For more options, visit https://groups.google.com/d/optout.
