home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!dtix!darwin.sura.net!gatech!bloom-beacon!INTERNET!dont-send-mail-to-path-lines
- From: hiebeler@Think.COM (Dave Hiebeler)
- Newsgroups: comp.theory.cell-automata
- Subject: Book: The Global Dynamics of CA
- Message-ID: <9208141216.AA25647@custard.think.com>
- Date: 14 Aug 92 12:16:59 GMT
- Sender: daemon@athena.mit.edu (Mr Background)
- Distribution: inet
- Organization: The Internet
- Lines: 59
-
-
- I've been told that the following book is now available through
- Addison-Wesley's SFI series. You may have seen Andy's talk on this
- subject if you were at the ALife-III conference.
-
-
-
- THE GLOBAL DYNAMICS OF CELLULAR AUTOMATA
- An Atlas of Basin of Attraction Fields of
- One-Dimensional Cellular Automata.
-
- Andrew Wuensche
- Mike Lesser
-
- Foreword by Chris Langton
-
- Diskette included for PC-compatible computers.
-
- Santa Fe Institute Studies in the Sciences of Complexity
- Reference Vol 1
- Addison-Wesley Publishing Co. Reading MA, phone:(800) 447 2226
- IBSN 0-201-55740-1 price: about $54
-
- Abstract:
- The Global Dynamics of Cellular Automata introduces a new global
- perspective for the study of discrete dynamical systems, analogous to
- the phase portrait in continuous dynamical systems.
- As well as looking at the unique trajectory of the systems future,
- an algorithm is presented that directly computes the multiple merging
- trajectories that may have constituted the system's past. A given set
- of cellular automata parameters will, in a sense, crystallize state
- space into a set of basins of attraction that will typically have the
- topology of branching trees rooted on attractor cycles. The explicit
- portraits of these mathematical objects are made accessible. The Atlas
- presents two complete classes of such objects: for the 3-neighbour
- rules (elementary rules) and for the 5-neighbour totalistic rules.
- The book looks in detail at CA architecture and rule systems, and
- the corresponding global dynamics. It is shown that the evolution of CA
- with periodic boundary conditions is bound by general principles
- relating to symmetries of the circular array. The rule numbering system
- and equivalence classes are reviewed. Symmetry categories, rule
- clusters, limited pre-image rules, and the reverse algorithm are
- introduced. The Z parameter (depending only on the rule table) is
- introduced, reflecting the degree of pre-imaging, or the convergence of
- dynamical flow in state space evident in the basin of attraction
- field. A relationship between the Z parameter, basin field topology,
- and rule behaviour classes is proposed. A genotype-phenotype analogy
- looks at the effect of mutating the rule table to produce mutant basin
- fields.
- The accompanying software is an interactive research tool capable of
- generating basins of attraction for any of the 2^32 CA rules in
- 5-neighbour rule space (for a range of array size), as well as
- pre-images, space-time patterns and mutation. The operating
- instructions are contained in the book.
- * * * * * *
-
- --
- Dave Hiebeler | hiebeler@think.com
- Thinking Machines Corporation | (617) 234-4070
-