On 26 Feb 2013, at 23:51, meekerdb wrote:

On 2/26/2013 1:46 PM, John Mikes wrote:
Brent: forgive my weak 'brain': in the turmoil of BackAndForces on this list it faded what you (really?) mean by
     quasi classical physics

I mean the world model of Newton and Maxwell plus a little randomness from QM: consisting of distinct objects in definite locations, not wave functions in infinite dimensional Hilbert space.

      brains

Biological information processors found within skulls.

      and what 'ideas' is (your) 'comp' based on?

?? My comp?


I think whatever we 'experience' is a (fortunate?) anthropic accident (incident?). <I put (your) to comp, because I am not sure about Bruno's "IF true" - and you did not refer to it either. >

Dinos? We know so little about the past of this world - even about not-so ancient HUMAN past (Dravidians) so infulential into our present world. Or how the Simians straightened up their spine to become human? (I am in favor of the 'aequatic ape' dream). And others.

Dinosaurs were just an example. I wondered what Bruno meant by saying we were here from the beginning.

I am not sure having said that. I might have mean this in the arithmetical ontological sense perhaps. If you find the quote I can say more.



Was he denying there was a pre-human past?


Certainly not. The prehuman-past is quite plausible, but it is not something absolute. It is something relative to many computations, which exists out of time and space.





I hope you are not talking about TOE derived at Dino-time, or later.
(BTW: was a neuron of a dino bigger than that of today's mouse?
With what size atoms? I asked this questions from many bio-people over the past 50 years - no answer so far.

Some of them were certainly longer.

Isaac Asimov once speculated that the size of dinosaurs was limited because the larger an animal the faster it can run, but dinosaurs had unmylenated neurons (like those in our brains) which are quite slow in transmitting signals. So when a dinosaur got very big he could run off a cliff right in front of him because the signal from his eyes to brain to feet would propagate more slowly than his forward motion. :-)

Lol,


Bruno




Brent

Maybe the Savants of this list can answer it?)

JM

On Tue, Feb 26, 2013 at 4:03 PM, meekerdb <meeke...@verizon.net> wrote:
On 2/26/2013 4:50 AM, Bruno Marchal wrote:
That does not work. We belong automatically to an infinity of computations. With comp, the physical reality is unique, and derivable from 0, s, + and * (and the usual axioms). But cosmos or branch of a multiverse can be numerous, but before they differentiated, we are in all of them.

That raises questions like, "Where were we when dinosaurs roamed the Earth?" Or more generally does the physics of every universe consistent with comp include quasi-classical physics? It seems that it is necessary for brains to exist and to have the ideas on which comp is based. Are we to regard this as just a fortunate anthropic accident?

Brent
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