Good story-telling and odd tech; decent awe-and-wonder of mysterious trans-humanism. It is somewhat like Larry Niven's "smoke ring" (Integral trees) world. Among the world building issues that pushed me out of the story is the existence of petrochemicals and manufacturing processes that rely on strong gravity. I may not read the rest of the series or his later books, 3/5 stars.
Saturday, March 2, 2019
Friday, March 1, 2019
The lost fleet beyond the frontier Steadfast by Jack Campbell
Poor treatment of the AI menace, good mystery and politics, 3/5 stars.
-- mfw@wyle.org | 1.425.249.3936
Tuesday, February 26, 2019
Sunday, February 17, 2019
Saturday, February 16, 2019
new advances in understanding superpermutations
If a television series has three episodes, there are six possible orders in which to view them: 123, 132, 213, 231, 312 and 321. You could put these sequences together to give a list of 18 episodes for every ordering, but there’s a much more efficient way to do it: 123121321. If you want to watch all possible rearrangement of sequences of a 7-part tv series, how many total episode viewings are required? What if the tv show has an infinite number of episodes? A sequence that contains every possible rearrangement (or permutation) of a collection of n symbols is a “superpermutation.”
Progress on this interesting, and easily-understandable 25-year-old combinatorial problem in mathematics has upper- and lower-bound proofs discovered recently by a pair of unexpected authors: an anonymous contributor to 4chan and a science fiction author in Perth Australia.
Some University of Florida math professors, citing "unknown 4chan poster" have verified, clarified, and reformulated a proof for the lower bound to the length of any superpattern. And Greg Egan, the famous SF author, has published a proof for the upper-bound along with C and JavaScript source code implementations of his algorithm.
Thursday, February 14, 2019
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