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- Date: Fri, 4 Sep 1992 12:02:02 PDT
- Sender: "Control Systems Group Network (CSGnet)" <CSG-L@UIUCVMD.BITNET>
- From: Penni Sibun <sibun@PARC.XEROX.COM>
- Subject: Re: AI stuff
- In-Reply-To: "William T. Powers"'s message of Fri,
- 4 Sep 1992 09:58:25 -0700
- <92Sep4.101200pdt.11702@alpha.xerox.com>
- Lines: 63
-
- (ps 920904.1200)
- [From Bill Powers (920904.1100)]
-
- Penni Sibun (920902.1400) --
-
- > well, i don't suppose solipsism is very useful.
-
- That's too easy an answer. Control theory is not about solipsism. It
- just recognizes that we don't all experience the same environment, so
- whatever you say about the environment is probably not true for
- everyone else. I don't doubt that there's an environment there. What I
- do doubt is that our perceptual representations of it are isomorphic
- to it.
-
- i didn't say control theory was about solipsism. you said everyone
- ``out there'' is imaginary. i don't think that has explanatory power.
- and i certainly don't say that perc. reps are isomorphic to the
- env.--shoot me as a cognitivist if i do! and remember, i'm not trying
- to talk about the enviroment. a message ago, we were agreeing that
- instituions were processes, not objects. you don't hold that
- processes are out there in the environment, do you?
-
- OK, I think that's what I said. The automaton itself could behave in
- unpredicted ways while still being deterministic. I suppose your
- definition would hold even if the automaton is deterministic, but one
- of its computing elements computes a random action when it's
- operating.
-
- automata are just math. when you say ``4 + 7 = 11'' it doesn't matter
- 4 what or 7 what or what it looks like when you've got the 11
- together. that's just not part of the mathematical description.
-
- Automata that are theoretical abstractions aren't very interesting,
- are they? I prefer mine to be "concrete-situated."
-
- no. but yr original question had to do w/ terminology, and i tried to
- explain that terminology. i do think that, as w/ any other field, to
- really understand what the practitioners are talking about, you need
- to have some idea of the foundations. theory of computation is one
- such for ai.
-
- >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.
-
- OK. The problem with discrete time is that it rules out real physical
- phenomena unless it's handled in a way I haven't seen in any AI
- models. Physical phenomena take place continuously, and their
-
- right. ai models are like this, basically cause the run (or are
- supposed to) on digital computers. i don't think you'll find anyone
- that would argue that there's something missing by not being able to
- model continuous time. the issue is more how close and/or useful your
- approximation is.
-
- I've written a persuasive letter to Chapman, by the way. It's worth
- another try.
-
- what did you try to persuade him of? just curious.
-
- cheers.
-
- --penni
-