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- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!spool.mu.edu!agate!linus!linus.mitre.org!news
- From: jthomas@kolanut.mitre.org (Joe Thomas)
- Subject: Re: Self-Reference and Paradox (was Re: Human intelligence...)
- Message-ID: <1992Dec22.170547.13875@linus.mitre.org>
- Sender: news@linus.mitre.org (News Service)
- Nntp-Posting-Host: kolanut.mitre.org
- Organization: The MITRE Corporation
- References: <wa1uVB2w165w@cybernet.cse.fau.edu>
- Date: Tue, 22 Dec 1992 17:05:47 GMT
- Lines: 42
-
- In article <wa1uVB2w165w@cybernet.cse.fau.edu> tomh@cybernet.cse.fau.edu (Tom
- Holroyd) writes:
- > mccolm@darwin.math.usf.edu. (Gregory McColm) writes:
- >
- > > Being lazy, I skipped over the logic parts of Penrose's book.
- > > Two logicians I know claim that the logic part is a mess, and
- > > some of the scientific reviews are very negative. While I
- > > can't comment on the physics (I suspect that he knows what he
- > > is doing there, but I am completely non-expert), I can say that
- > > his discussion on ethology (animal psychology) is uninformed
- > > and decades out of date.
- >
- > Flame on.
- >
- > Actually, his physics isn't that great either. He pretty much
- > ignores non-equilibrium physics (he sticks to equilibrium thermo-
- > dynamics for much of the book, and in one place even calculates
- > the probability of the universe based on classical entropy as
- > one part in 10**(10**123). (p.344) This is a totally absurd number).
- >
- > Most phenomena that are mysterious to "classical" (i.e. newtonian)
- > physics are well understood in terms of the pattern and structure
- > forming properties of systems that are far from equilibrium, which
- > includes among other things, us. When energy flows *through* a
- > system, it can self-organize; this is in contrast with the closed
- > systems of classical physics. The universe may or may not be closed,
- > but locally, it is certainly not closed, and most of the physics in
- > Penrose's book doesn't apply.
-
- I had a lot of problems with Penrose's book, myself, but I didn't think his
- entropy discussion was that far off (as a non-expert). Arguments about
- self-organization in open systems don't seem relevant here; what Penrose was
- describing was the low entropy of the _initial_ state of the universe, before
- anything could have self-organized.
-
- In any case, is your statement that the universe is "certainly not closed"
- meant to imply that energy "flows *through*" the universe from high entropy
- to low entropy the same way it flows through living creatures? Where does
- the energy come in and go out? I thought the universe _was_ considered
- closed in this way.
-
- Joe
-