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Math

44 Conjectures of Stephen Wolfram Disproved 158

Posted by kdawson from the new-kind-of-error dept.
Richard Pritches writes in to let us know that MIT errata expert Evangelos Georgiadis has disproved 44 conjectures set by Dr. Stephen Wolfram (founder of Mathematica) in A New Kind of Science. The paper was published in the latest issue of the Journal of Cellular Automata and can be read in PDF form at Prof Edwin Clark's collection of reviews of Wolfram's ANKS. "The formulas provided by Wolfram for these [44] rules are not minimal. Moreover for 8 of these cannot be minimal even by simple inspection since minimal formula sizes for 3-input Boolean functions over this basis never exceeds 5."
Programming

Submission + - New Squeak Smalltalk book published (squeak.org) 1

Submitted by mykdavies
mykdavies writes: Squeak is a multi-platform Open Source Smalltalk, and home of eToys, which is included in the OLPC XO laptop due to be released later this year. Due to the growing interest in the language, a group of Squeakers has just released a new introduction to Squeak. The book, Squeak By Example, is a step-by-step guide to the language and the environment. It's available as a free PDF, or as hard-copy from lulu.com — see the book's website for details.

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