[math-fun] Unabomber's Belongings To Be Auctioned
The book list starts here: http://www.thesmokinggun.com/archive/0811062tedk9.html -- Thane Plambeck http://www.plambeck.org/ehome.htm
He must have lost interest in math -- I didn't see any interesting math books. There were a few too many books on poisonous plants & mushrooms. The hooded sweatshirt will probably fetch the highest price. At 12:21 PM 8/11/2006, Thane Plambeck wrote:
The book list starts here:
http://www.thesmokinggun.com/archive/0811062tedk9.html
-- Thane Plambeck http://www.plambeck.org/ehome.htm
I'm writing up some histories of various puzzle types. One of them is Number Link. http://www.nikoli.co.jp/en/puzzles/number_link/ So far as I can tell, the first example of something like this is by Sam Loyd, Puzzleland Park, page 61. http://www.mathpuzzle.com/loyd/cop060-061.html (puzzle) http://www.mathpuzzle.com/loyd/cop346-347.html (answer) After reading Jerry Slocum's The 15 Puzzle, I'm afraid to attribute anything to Sam Loyd, unfortunately. So I thought I might ask around. Has anyone seen other early connect-without-crossing puzzles? Ed Pegg Jr
My column about snaky puzzles is up. http://www.maa.org/editorial/mathgames/mathgames_08_17_06.html I'm sure I missed a few things. I started looking at crossing numbers is graphs, for example. Consider a graph where every edge is crossed by N other edges. No edge crosses itself, or any edge it is adjacent to. Then that graph has writhing number N. All planar graphs have writhing number 0. A pentagon can have writhing number 2 (a thrackle). I wasn't able to figure out if a cubic graph could be anything but writhing-0, before I put my scribbles away and got back to finishing the column. --Ed Pegg Jr
participants (3)
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Ed Pegg Jr -
Henry Baker -
Thane Plambeck