X-Message-Number: 20806
From: 
Date: Tue, 7 Jan 2003 17:52:39 EST
Subject: Re: CryoNet #20798 We don't need no stinkin' tensor calculus

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From: "Steve Harris" <>

> I can pretty much guarantee that nobody reading cryonet is interested in
> your exposition of differential geometry, Yvan. [And if this isn't true,
> that one person can let you and I know, and you can send your stuff to that
> person instead of this list].
> 

First, cryonet readers are not all known on that list at time of your 
writting. Most of them will be in the distant future, they'll be Internet 
archeologist in some way. One of their interest may be to find what was 
running in now long time frozen bodies. That is why Cryonet can't be reduced 
to day to day chat on bogus cloning for example.

Second, like it or not, current instrumentation, even pushed to nano-level, 
will never bring back anybody to life. There is a fundamental need for  
better technologie, far beyond what biology can hope to do. On possible 
technology is high pressure helium 3 MRI at low temperature to map the brain 
and even the full body at sufficient resolution.

Third, even that is not sufficient, the science basis of technology must be 
expanded. Think for example of the case where a large part of the brain has 
been destroyed by decay before freezing or a neurodegenerative pathology. How 
do you map a structure wipped out days, months or years ago?

If there is a solution, it must include:
a/ A memory effect on a sufficient time.
b/ A way to read at a distance what was the destroyed structure.

The a/ implies a protected environment, found only in exothics quantum 
systems, if you are alergic to maths, you are on a bad way here.

The b/ needs a way to bring at a local, readable point the distant 
information. So you need a way to translate non-local informations into a 
local one. To bring something from a place to another is modeled by the 
so-called covariant derivative and the non-linerar element in Christofeld 
symbol. If I said what I think about such potential technologies, it would 
look as Harry Potter derived, so there must be some basis, even if at an 
early stage, most first generation readers are better at skipping it.

What seems so weird to you, is simply the inclusion of border effects ( right 
or left only derivatives) in second order corrected variable quantities. 
Poincare knew it a century ago and made a mnemonic for the formula :-) (sorry 
it is in french).

Yvan Bozzonetti.

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