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- Date: Thu, 3 Sep 1992 21:39:30 PDT
- Sender: "Control Systems Group Network (CSGnet)" <CSG-L@UIUCVMD.BITNET>
- From: Penni Sibun <sibun@PARC.XEROX.COM>
- Subject: Re: Skinner & Control; More cooking; variaboili
- In-Reply-To: "William T. Powers"'s message of Thu,
- 3 Sep 1992 08:33:41 -0700
- <92Sep3.085756pdt.11627@alpha.xerox.com>
- Lines: 76
-
- (ps 920903.2200)
-
- [From Bill Powers (920903.0800)]
- --
- Penni Sibun (920902.1400) --
-
- >well, of course, to interactionists, institutions are neither in the
- >head nor in the evironment, but.... this list, csgl, is an
- institution >cause we are all participating in it. it's not my head,
- it's not in >your head, and it's not out there in the environment
- somewhere just >sitting around.
-
- My problem with institutions is that they're nouns, whereas what goes
- on between organisms are processes and interactions -- verbs.
-
- yes, i agree. that's suggested by ``participation.''
-
- What
- something like CSG-L "is" depends on who's looking at it. For me, it's
- an ongoing conversation with a person to claims to be Penni Sibun,
- someone who uses the name Rick Marken, a writer who expresses himself
- very much like Chuck Tucker, and so forth. The only real person on
- this net is me. From someone else's viewpoint, I'm imaginary. What the
- net "is" depends on each user's conception of it, and that conception
- isn't out there in the world. It's in a head.
-
- well, i don't suppose solipsism is very useful. unless you want to
- assume that everything is imaginary, then this list is something real.
- its existence depends on our actively maintaining it.
-
- >``...we shall...permit several possible `next states' for a given
- >combination of current state and input symbol. the automaton
- >[machine]...may choose at each step to go into any one of these legal
- >next states; the choice is not determined by anything in our model,
- >and is therefore said to be _nondeterministic_.''
-
- Doesn't your quote say explicitly that it _is_ the machine's problem?
- "The automaton [machine] may choose at each step to go into any one of
- these legal next states..."
-
- I think that what the quote means is that it isn't the _programmer_'s
- problem -- that is, the simulation or model or whatever is making its
- own choices based on current experience, rather than having those
- choices programmed in from the start. But if you include the state of
- the environment and the criteria for choosing, then the automaton is
- deterministic, even if the programmer didn't determine its choices.
- The only way I can see to produce a nondeterministic outcome is to
- make the choice using random numbers or the output of a Geiger
- counter.
-
- well, i probably confused you by saying ``machine''--let's stick to
- ``automaton.'' at any rate, neither is a program: an automaton is a
- description, a theoretical abstraction. one can perfectly rigorously
- say whether an automaton is deterministic or not; i gave the def.
- above. determinism does not describe what the automaton does, it
- describes how it is built.
-
- i recommend the book i cited for learning about computational theory.
- interestingly, chomsky can be blamed for a lot of it.
-
- >in section ``ontology of cooking tasks,'' a&h say: ``a _history_ is
- a
- >function from natural numbers (representing `time') to world
- states.''
- >roughly, a history is a record of what happens during a run of toast.
-
- This still doesn't answer my question. If an operation like "put pan
- on burner" is carried out, I assume that the history would record the
- pan first in some other place, then after the operation, the pan on
- the burner. What I was asking was whether the position of the pan was
- recorded in this history over the whole trajectory between "on the
- counter" and "on the burner," or whether just the end positions were
-
- the natural numbers are the positive integers starting from 1, so a
- function from natural numbers to world states implies discreet rather
- than continuous time.
-