[FRIAM] Any non-biological complex systems?

[Stephen Guerin]

Glen writes:
>
> Not quite.  If these systems merely contain subsystems capable of
> exhibiting complexity, then those 3 you listed are not complex systems.
> They are "subsystems capable of exhibiting complexity".  So, no.  They are
> not complex systems in isolation.  Russ' question, I think, targets
> naturally occurring, whole complex systems.


We disagree on the use of systems and subsystems in the context of phase
space then. To me, there is one system and that system has a phase space -
There are not multiple subsystems in the phase space. And as there are
multiple use of phase space I mean it in this sense:

https://en.wikipedia.org/wiki/Phase_space

The phase space can also refer to the space that is parametrized by the
*macroscopic* states of the system, such as pressure, temperature, etc. For
instance, one may view the pressure-volume diagram or entropy-temperature
diagrams as describing part of this phase space. A point in this phase
space is correspondingly called a macrostate. There may easily be more than
one microstate with the same macrostate. For example, for a fixed
temperature, the system could have many dynamic configurations at the
microscopic level. When used in this sense, a phase is a region of phase
space where the system in question is in, for example, the liquid
<https://en.wikipedia.org/wiki/Liquid> phase, or solid
<https://en.wikipedia.org/wiki/Solid> phase, etc.





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On Fri, May 26, 2017 at 6:08 PM, glen ☣ <gepropella at gmail.com> wrote:

> On 05/26/2017 04:54 PM, Stephen Guerin wrote:
> > I am listening to Russ. I do think he's defining a sub-class of complex
> > systems (eg living systems). I would like to keep the definition of
> > "complex systems" broader than that though.
>
> OK.  But I don't think he's necessarily _asserting_ that only living
> systems are complex systems.  He's just asking the question and engaging in
> a discussion wherein we might be able to refine his sub-category so that it
> includes physical systems.
>
> > I understand the subtle distinction your trying to make. I would say the
> > full phase space of a *complex system* has narrow critical regimes in
> their
> > behavior (phase) space where *complex behavior* is observed as the
> control
> > parameters are swept through the phase transition. In the critical regime
> > we see complex behavior like sensitivity to initial conditions, critical
> > slowing down, critical fluctuations, power law statistics, long-range
> > correlations, etc. On either side of the phase transition (eg
> sub-critical
> > and super-critical) regimes, these statistics and behaviors are not
> present.
> >
> > That said, while the critical regime may be narrow in phase space many of
> > these system "self-tune" to the critical point but that's another thread.
> >
> > Agreed?
>
> Not quite.  If these systems merely contain subsystems capable of
> exhibiting complexity, then those 3 you listed are not complex systems.
> They are "subsystems capable of exhibiting complexity".  So, no.  They are
> not complex systems in isolation.  Russ' question, I think, targets
> naturally occurring, whole complex systems.
>
> Now, if we add the experimental apparatus that, eg, maintains a ZB
> reaction for a long time, then that _whole_ system can be called a complex
> system.  But there's significant meat to the controlling subsystem ... and
> we biological creatures instantiated it.  The case is the same with, say,
> glycolysys.
>
> All you need do is identify the circumstances where those three processes
> (ferromag, benard cells, BZ reactions) occur in nature and then we might be
> able to identify the systems in which they sit.  Then we can test them
> against whatever predicate we want.
>
> --
> ☣ glen
>
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