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
Sunday, February 10, 2019
Our Transparent Society
https://medium.com/@jeffreypbezos/no-thank-you-mr-pecker-146e3922310f Is very encouraging.
mfw@wyle.org | 1.425.249.3936
Wednesday, February 6, 2019
City on the Edge forever by Harlan Ellison (original script and essays)
The original Star Trek series from 1964 has always been near and dear to me. I was also a fan of Harlan Ellison's writings. Harlan died last June and this new collection of essays about the controversy of his original award-winning script vs the episode that aired on TV was reissued. It was fun to read points of view from my favorite celebrities of the 1960s again, very nostalgic. 3/5 stars.
Saturday, February 2, 2019
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