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- From: frank@D012S658.uucp (Frank O'Dwyer)
- Newsgroups: alt.atheism
- Subject: Re: contradictory nature of free will and omni-anything
- Message-ID: <1k69nkINNd21@horus.ap.mchp.sni.de>
- Date: 27 Jan 93 15:28:52 GMT
- References: <1jl1rfINNc91@srvr1.engin.umich.edu> <1993Jan22.170557.4387@st-andrews.ac.uk> <1jq6eqINNm3f@srvr1.engin.umich.edu>
- Reply-To: odwyer@sse.ie
- Organization: Siemens-Nixdorf AG
- Lines: 61
- NNTP-Posting-Host: d012s658.ap.mchp.sni.de
-
- In article <1jq6eqINNm3f@srvr1.engin.umich.edu> ingles@engin.umich.edu (Ray Ingles) writes:
- #In article <1993Jan22.170557.4387@st-andrews.ac.uk> nrp@st-andrews.ac.uk (Norman R. Paterson) writes:
- #
- #[deletions]
- #
- #>I think free-will is an illusion. There's also a difference between being
- #>determined and being predictable, as I will try to show. In the following
- #>I use the term "computer" to mean "hardware + software".
- #>
- #>A computer's behaviour is entirely determined (ignoring quantum effects for
- #>the moment). It's progression from one state to the next is hard-wired.
-
- No. If I stand beside your computer flicking the on/off switch, what sense
- is there in what you say? You are viewing the computer as a closed system.
- Nice try - but this closed system isn't the universe. Look what it's doing
- to the laws of thermodynamics. It has a funny idea of gravity too.
-
- #>However, it is impossible to _predict_ what a given computer will do. If
- #>you want to find out, you have to let it run, and wait for it to finish.
- #>(This is the basis of the halting problem: you can't even predict whether
- #>any given computer will halt or not.)
-
- True. If it were determined, it would still be unpredictable. But you
- have yet to show that even a computer's behaviour is determined.
-
- # Well, in *practice*, yes, things may not be predictable. But in principle
- #they need not be unpredictable. As an example, take the process:
- #
- # Given an integer:
- # If even, divide by two.
- # If odd, multiply by three and add one.
- # Repeat.
- #
- # As far as anyone knows, any integer you do this to will eventually go
- #to one. But no one has proved it; there may be a 'loop' that doesn't
- #include the number 'one'.
- # I could make a turing machine to run this procedure for all integers,
- #stopping if it finds a sequence that loops. Now, as far as anyone knows,
- #it will never stop.
- # But, there is nothing that says that we might not find a proof that it
- #will or won't stop. Some clever individual may find a proof that all
- #integers go to one under that process. *Then* we would know.
-
- This is akin to the belief that one day science will explain everything
- in the universe. How do you distinguish an infinite procedure from one
- which is going to terminate in the next second. How long will you wait
- before you hit the abort key?
-
- [...]
-
- # Also, what if we run the same program on two computers, but one is faster
- #than the other? If the faster one stops, we can know that the slower one
- #will stop.
-
- Unless it blows up. Or I spill coffee on the disk. Or I trip on the power
- cord. Dashed unpredictable these users - something about free will...
-
- # Ray Ingles ingles@engin.umich.edu
-
- Frank O'Dwyer
- odwyer@sse.ie
-