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The Cell Hijackers
Technology Review ^ | June 2004 | Rodney Brooks

Posted on 05/18/2004 2:02:33 PM PDT by LibWhacker

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To: Doctor Stochastic

I think your discussion hits the mark. Our means of communication already is prejudiced towards 'not', 'and', and 'or'. We use a conjunction of two to describe the sufficient operators, not or = nor, not and = nand. Mendelson in "Introduction to Mathematical logic" calls them 'joint denial' and 'alternative denial'.


21 posted on 05/18/2004 9:30:52 PM PDT by AndrewC (I am a Bertrand Russell agnostic, even an atheist.</sarcasm>)
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To: AndrewC

I have this fight constantly (really intermittently but often) with language design; computer design; etc. people. I want ease of writing and reading, not minimalist proofs of correctness. (The proofs have their place, just not in expository text.) The book "The Psychology of Everyday Things" (can't recall the author) is rather useful. The author did come up with the comment about architecture: "If it won a prize, it's probably useless."


22 posted on 05/18/2004 9:45:23 PM PDT by Doctor Stochastic (Vegetabilisch = chaotisch is der Charakter der Modernen. - Friedrich Schlegel)
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To: Malsua
. . . completely autonomous systems with long life spans capable of doing just about anything. Imagine, a group of cells, undiscernable from the local environment, . . .

Gee, I hope mankind doesn't meet any highly advanced extraterrestrials in the next couple of centuries! They will surely try to exterminate us because this stuff, nanotech, etc., will be an unacceptable danger to them.

23 posted on 05/18/2004 9:46:59 PM PDT by LibWhacker
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To: Doctor Stochastic
Principia Mathematics is hard to read more because of the choice of notation that because of the difficulty of its proofs.

I've heard it said only two people understand Principia Mathematica, and both of them are dead. :-)

24 posted on 05/18/2004 9:49:46 PM PDT by LibWhacker
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To: LibWhacker

Actually there are three. One's dead; one's me; and the other is Cole Thornton.


25 posted on 05/18/2004 9:53:56 PM PDT by Doctor Stochastic (Vegetabilisch = chaotisch is der Charakter der Modernen. - Friedrich Schlegel)
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To: Doctor Stochastic
Holy cow, Doc . . . I am VERY impressed, and I mean that sincerely. The only thing I know about it are a few things various professors said about it in class; namely, that Russell and Whitehead tried to reduced arithmetic to its logical foundations (but failed) and that it took them 150 pages to prove that 1 + 1 = 2. Is that true?
26 posted on 05/18/2004 10:06:16 PM PDT by LibWhacker
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To: LibWhacker

I took them a long time. They were very wordy. The problem was partly their notation and partly (though not know at the time) that their project was impossible. They wanted to reduce all mathematics to logic but Goedel (and Post before him but unpublished) showed that this is impossible.

One problem was that they spent lots of time just defining a number. Then they worried about Russell's paradox and others. To get around these paradoxes (paradice is probably the Greek plural), they introduce a theory of types. Unfortunately, determining the type of a set isn't always possible.

There are better books (more readable) available. You might (if your are interested) check reviews at Amazon or other review sites.


27 posted on 05/18/2004 10:22:33 PM PDT by Doctor Stochastic (Vegetabilisch = chaotisch is der Charakter der Modernen. - Friedrich Schlegel)
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To: Doctor Stochastic
Oh, no, Doc . . . I don't think I want to tackle something like that at this stage in my life, thank you very much! :-)

I'm confused now -- and curious, too -- Doc. I always assumed from your screen name that your specialty was stochastic processes or something like that. But is it mathematical logic instead? I think we have at least one other Freeper who has a doctorate in mathematical logic.

28 posted on 05/18/2004 10:51:00 PM PDT by LibWhacker
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To: PatrickHenry
From the article: "our industrial infrastructure will be transformed. Fifty years ago it was based on coal and steel. Now it is based on silicon and information. Fifty years from now it will be based on living systems."

And nearly 100 years ago, Upton Sinclair alerted the world to the horrors of the meat packing industry...an industry based quite literally upon the blood, sweat and flesh of its employees. Let us hope we will not recreate, or even exceed, the nightmare.

29 posted on 05/19/2004 12:09:47 AM PDT by Aracelis
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To: Victoria Delsoul
I just wanted to give you a bump

I'll take whatever you give me.

30 posted on 05/19/2004 3:25:02 AM PDT by PatrickHenry (A compassionate evolutionist!)
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To: sarasmom
Try Discworld. It's almost, but not completely, unlike Hitchhiker's Guide to the Galaxy.
31 posted on 05/19/2004 3:39:49 AM PDT by Junior (Sodomy non sapiens)
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To: Bon mots

Ok. I stand corrected. Technology can always be harnassed for evil. I guess I was trying to break the shackles of tautology, but I yield. Those shackles can't be broken.

Technology is one of the things people do. Evil is another one of the things people do. People are always capable of evil. Therefore, technology can always be harnassed for evil.

Tautology accepted.

Yawn.


32 posted on 05/19/2004 4:37:05 AM PDT by samtheman (www.georgewbush.com)
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To: LibWhacker

Actually, my speciality is Monte Carlo computations. Lately though I've been doing just some statistics and numerical analysis.


33 posted on 05/19/2004 5:52:31 AM PDT by Doctor Stochastic (Vegetabilisch = chaotisch is der Charakter der Modernen. - Friedrich Schlegel)
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