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Math

Wolfram's 2,3 Turing Machine Not Universal 284

Fishbat writes "In a cutting message to the Foundations of Mathematics mailing list, Stanford's Vaughan Pratt has pointed out an elementary mistake in the recently announced proof that Wolfram's (2,3) machine is universal." Update: 10/30 04:18 GMT by KD : Ed Pegg Jr. from Wolfram Research points to this response to Dr. Pratt's note, which has been submitted to the FoM mailing list but has not yet appeared there due to moderation.

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Q: How many IBM CPU's does it take to execute a job? A: Four; three to hold it down, and one to rip its head off.

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