Friday, February 21, 2020
Thursday, February 20, 2020
In Memory of Jack Youngerman…
… An abstract artist who reportedly died at 93 yesterday.
A search in this journal for Shubnikov yields…
"Raiders of the Lost Stone" (December 26, 2017).
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Once Upon a Time in Las Vegas
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In Memory of Hunter S. Thompson
“Continue to exercise caution with stories that can only be
corroborated by dead guys."
— Intelligence officer Frank Anderson in the previous post.
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Tale
“Continue to exercise caution with stories that can only be
corroborated by dead guys. Fabricated stories are almost
never made up out of whole cloth, but are made by stitching
together generally known facts with bits of uncheckable fantasy.”
— Intelligence officer Frank Anderson, who reportedly
died on January 27, 2020.
This journal on that date —
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Wednesday, February 19, 2020
Aitchison’s Octads
The 759 octads of the Steiner system S(5,8,24) are displayed
rather neatly in the Miracle Octad Generator of R. T. Curtis.
A March 9, 2018, construction by Iain Aitchison* pictures the
759 octads on the faces of a cube , with octad elements the
24 edges of a cuboctahedron :
The Curtis octads are related to symmetries of the square.
See my webpage "Geometry of the 4×4 square" from March 2004.
Aitchison's p. 42 slide includes an illustration from that page —
Aitchison's octads are instead related to symmetries of the cube.
Note that essentially the same model as Aitchison's can be pictured
by using, instead of the 24 edges of a cuboctahedron, the 24 outer
faces of subcubes in the eightfold cube .
Image from Christmas Day 2005.
* http://www.math.sci.hiroshima-u.ac.jp/branched/files/2018/
presentations/Aitchison-Hiroshima-2-2018.pdf.
See also Aitchison in this journal.
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Friday, September 23, 2016
Annals of Scientism
Last night, Thursday, Sept. 22, 2016, at Harvard's Sanders Theatre,
the annual Ig Nobel prizes were awarded.
This journal earlier that day —
Related material —
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