Log24

Sunday, April 17, 2022

Easter for Aitchison*

Filed under: General — Tags: , — m759 @ 7:07 am

* See other posts tagged Aitchison in this journal.

Wednesday, February 19, 2020

Aitchison’s Octads

Filed under: General — Tags: , , , , , — m759 @ 11:36 am

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 .

The Eightfold Cube: The Beauty of Klein's Simple Group

   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.

 
[addtoany]
 

Tuesday, December 17, 2019

Picturing Aitchison’s Mathieu Generators

Filed under: General — Tags: , — m759 @ 11:07 am

Click to enlarge.

Friday, November 29, 2019

Verifying Aitchison’s Cuboctahedral Generation of M24

Filed under: General — Tags: — m759 @ 1:06 am

Iain Aitchison on symmetric generation of M24

Shown below are Aitchison's March 2018 M24 permutations
and their relabeling, with digits only, for MAGMA checking.

In the versions below, r g b stand for red, green, blue. 
Infinity has been replaced by 7 (because a digit was needed,
and the position of the infinity symbol in the Aitchison cube
was suited to the digit 7).

             (r7,r1)(b2,g4)(r3,r5)(r6,g0)
 mu0=   (g7,g2)(r4,b1)(g6,g3)(g5,b0)
             (b7,b4)(g1,r2)(b5,b6)(b3,r0)

 mu1 =  (r7,r2,)(b3,g5)(r4,r6)(r0,g1)
             (g7,g3)(r5,b2)(g0,g4)(g6,b1)
             (b7,b5)(g2,r3)(b6,b0)(b4,r1)

 mu2 =  (r7,r3)(b4,g6)(r5,r0)(r1,g2)
             (g7,g4)(r6,b3)(g1,g5)(g0,b2)
             (b7,b6)(g3,r4)(b0,b1)(b5,r2)

 mu3 =  (r7,r4)(b5,g0)(r6,r1)(r2,g3)
             (g7,g5)(r0,b4)(g2,g6)(g1,b3)
             (b7,b0)(g4,r5)(b1,b2)(b6,r3)

 mu4 = (r7,r5)(b6,g1)(r0,r2)(r3,g4)
            (g7,g6)(r1,b5)(g3,g0)(g2,b4)
            (b7,b1)(g5,r6)(b2,b3)(b0,r4)

 mu5 =  (r7,r6)(b0,g2)(r1,r3)(r4,g5)
             (g7,g0)(r2,b6)(g4,g1)(g3,b5)
             (b7,b2)(g6,r0)(b3,b4)(b1,r5)

 mu6 = (r7,r0)(b1,g3)(r2,r4)(r5,g6)
            (g7,g1)(r3,b0)(g5,g2)(g4,b6)
            (b7,b3)(g0,r1)(b4,b5)(b2,r6)

Table 1 —

                0   1   2   3   4   5   6   7       
           r    1   2   3   4   5   6   7   8 
           g   9 10 11 12 13 14 15 16
           b 17 18 19 20 21 22 23 24 

The wReplace program was used with Table 1 above
to rewrite mu0-mu6 for MAGMA. 

The resulting code for MAGMA

G := sub< Sym(24) |
(8,2)(19,13)(4,6)(7,9)
(16,11)(5,18)(15,12)(14,17)
(24,21)(10,3)(22,23)(20,1),

(8,3)(20,14)(5,7)(1,10)
(16,12)(6,19)(9,13)(15,18)
(24,22)(11,4)(23,17)(21,2),

(8,4)(21,15)(6,1)(2,11)
(16,13)(7,20)(10,14)(9,19)
(24,23)(12,5)(17,18)(22,3),

(8,5)(22,9)(7,2)(3,12)
(16,14)(1,21)(11,15)(10,20)
(24,17)(13,6)(18,19)(23,4),

(8,6)(23,10)(1,3)(4,13)
(16,15)(2,22)(12,9)(11,21)
(24,18)(14,7)(19,20)(17,5),

(8,7)(17,11)(2,4)(5,14)
(16,9)(3,23)(13,10)(12,22)
(24,19)(15,1)(20,21)(18,6),

(8,1)(18,12)(3,5)(6,15)
(16,10)(4,17)(14,11)(13,23)
(24,20)(9,2)(21,22)(19,7)>;

G;
Order(G);
CompositionFactors(G);

The Aitchison generators passed the MAGMA test.

Friday, May 31, 2019

Working Sketch of Aitchison’s Mathieu Cuboctahedron

Filed under: General — Tags: , , — m759 @ 5:33 am

Cuboctahedron with its 24 edges labeled by the 24 permutations of a 4-set. By Cullinane on 5/31/19.

The above sketch indicates one way to apply the elements of S4
to the Aitchison cuboctahedron . It is a rough sketch illustrating a
correspondence between four edge-hexagons and four label-sets.
The labeling is not as neat as that of a permutahedron  by S4
shown below, but can perhaps be improved.

Permutahedron labeled by S4 .

 

Update of 9 PM EDT June 1, 2019 —

. . . And then of course  there is the obvious  labeling derived from 
the above permutahedron —

 
[addtoany]
 

Sunday, December 30, 2018

Also Sprach Aitchison

Filed under: General — Tags: , , — m759 @ 2:48 pm

The New Yorker  reviewing "Bumblebee"

"There is one reliable source for superhero sublimity,
and it’s all the more surprising that it’s a franchise with
no sacred inspiration whatsoever but, rather, of purely
and unabashedly mercantile origins: the 'Transformers'
series, based on a set of toys, in which Michael Bay’s
exhilarating filmmaking offers phantasmagorical textures
of an uncanny unconscious resonance."

— Richard Brody on December 29, 2018

"Before time began, there was the Cube."

— Optimus Prime

Iain Aitchison on symmetric generation of M24

Some backstory — A Riddle for Davos,  Jan. 22, 2014.

Thursday, December 6, 2018

The Mathieu Cube of Iain Aitchison

This journal ten years ago today —

Surprise Package

Santa and a cube
From a talk by a Melbourne mathematician on March 9, 2018 —

The Mathieu group cube of Iain Aitchison (2018, Hiroshima)

The source — Talk II below —

Search Results

pdf of talk I  (March 8, 2018)

www.math.sci.hiroshima-u.ac.jp/branched/…/Aitchison-Hiroshima-2018-Talk1-2.pdf

Iain Aitchison. Hiroshima  University March 2018 … Immediate: Talk given last year at Hiroshima  (originally Caltech 2010).

pdf of talk II  (March 9, 2018)  (with model for M24)

www.math.sci.hiroshima-u.ac.jp/branched/files/…/Aitchison-Hiroshima-2-2018.pdf

Iain Aitchison. Hiroshima  University March 2018. (IRA: Hiroshima  03-2018). Highly symmetric objects II.

Abstract

www.math.sci.hiroshima-u.ac.jp/branched/files/2018/abstract/Aitchison.txt

Iain AITCHISON  Title: Construction of highly symmetric Riemann surfaces , related manifolds, and some exceptional objects, I, II Abstract: Since antiquity, some …

Related material — 

The 56 triangles of  the eightfold cube . . .

The Eightfold Cube: The Beauty of Klein's Simple Group

   Image from Christmas Day 2005.

Monday, December 29, 2025

Octad Art — Bricks, Cubes, Flowers

For the bricks of the title, see other posts tagged Brick Space
For some cubes* and flowers, see below.

Combining features of the above two images, one might picture the 24
cells of the 4×6 array underlying the Curtis Miracle Octad Generator
(MOG) as each containing an eightfold cube, pictured as above with seven
of its subcubes showing and an eighth subcube hidden behind them.

The seven visible subcubes may be colored, as in the Curtis image of
the Klein map, with seven distinct colors… corresponding to the seven
edge-colors used in the Curtis-Klein map. Each of the seven visible
subcubes in a cell may also be labeled, on its visible faces, with a symbol
denoting one of the 24 points of the projective line over GF(23), just as the
faces in the Curtis-Klein map are labeled.  The hidden subcube in each cell
may be regarded as also so labeled, by the MOG label of the cell's position.

There is then enough information in the array's eightfold cubes' colors and
labels to construct the seven generating permutations of M24 described by
Curtis, and the 24 array cells may be regarded as now containing 24 distinct
entities — which perhaps might be called "octoids."

Those desiring a more decorative approach may replace the 24 labeled cubes
with 24 labeled "flowers." Each flower — like the map's symmetric seven
"petals" and the central "infinity heptagon" they surround — forms an octad.

Related Illustrations . . .

* See as well posts tagged Mathieu Cube . . .

Related material — 

The 56 triangles of  the eightfold cube . . .

The Eightfold Cube: The Beauty of Klein's Simple Group

   Image from Christmas Day 2005.

Post last revised:  December 30, 2025 @ 21:30 E.S.T.

Wednesday, October 15, 2025

Sextet Space

Filed under: General — Tags: , — m759 @ 4:46 pm

“Perhaps the philosophically most relevant feature of modern science
is the emergence of abstract symbolic structures as the hard core
of objectivity behind— as Eddington puts it— the colorful tale of
the subjective storyteller mind.”

— Hermann Weyl, Philosophy of  Mathematics and
    Natural Science 
, Princeton, 1949, p. 237

Melissa C. Wong, illustration for "Atlas to the Text,"
by Nicholas T. Rinehart:

The above fanciful illustration pictures 6*9=54 colored squares on the six 
faces of a 3x3x3 cube.

Compare and contrast the Aitchison  labeling, not unlike the one above,
of 6*4=24 unit squares (or, equivalently, 24 pips  at the squares' centers)
on a 2x2x2 cube.

Now consider how the 8-square "brick" of R. T. Curtis may be colored with
four colors using the 105 ways to partition its eight squares into four 2-sets.

By analogy, the 24  squares on a cube's  surface, as above, afford a cubical
space for applying six  colors to the sextet  partitions (into six 4-sets) of Curtis's
Miracle Octad Generator (MOG), using Aitchson's cubical model (with, of course,
the parts to be moved being pips or squares rather than cuboctahedron edges). 

The 4-coloring of Curtis bricks is useful in picturing the Klein correspondence.
Are there similar uses of  cube  6-colorings? Or 4-colorings? (Group actions on
a 6-set are of considerable combinatorial and algebraic interest because of
the exceptional outer automorphism of S6.)

For a colored presentation of sextet space modeled with a rectangle,
as in the Curtis MOG, see . . .

https://xenon.stanford.edu/~hwatheod/mog/mog.html .

Wednesday, August 6, 2025

Cubes

Filed under: General — m759 @ 1:33 am

From a post on the Feast of St. Nicholas, 2018, 
"The Mathieu Cube of Iain Aitchison" —

The Eightfold Cube: The Beauty of Klein's Simple Group

Compare and contrast . . .

The Supercube  of Solomon Golomb.

Sunday, March 16, 2025

Compare and Contrast

Filed under: General — Tags: — m759 @ 8:00 am

Magic cube and corresponding hexagram, or Star of David, with faces mapped to lines and edges mapped to points (The 6 cube faces are mapped to the 6 hexagram lines.)

Note that the triangles 5-9-12  and  7-8-11 in figure B above correspond
in cube A to vertices 
  and  0  in the Aitchison Hiroshima cube below.

Tuesday, January 14, 2025

Proofs

Filed under: General — Tags: , , — m759 @ 3:50 am

A phrase by Aitchison at Hiroshima . . .

"The proof of the above is a relabelling of the Klein quartic . . . ."

Related art — A relabelling of the Klein quadric  by Curtis bricks:

The Miracle Octad Generator (MOG) of R. T. Curtis

Update of 12:26 PM EST Wednesday, January 15, 2025  —

Here is a large (17.5 MB) PDF file containing all posts touching upon
the concept underlying the above illustration — the Klein correspondence.

(A PDF reader such as Foxit is recommended for such large files.)

Tuesday, January 7, 2025

Parallelisms

Filed under: General — Tags: , — m759 @ 12:56 am

'Dreaming Jewels' from October 10, 1985

Friday, August 2, 2024

For Harlan Kane:  The Stevens Title

Filed under: General — Tags: — m759 @ 6:00 am

Things of August*


Related narratives:

Related mathematics:

'Dreaming Jewels' from October 10, 1985

*

Wednesday, May 29, 2024

The Strong Law of Small Shapes*

Filed under: General — Tags: , , , , — m759 @ 9:52 am

Two examples:

The above note led to a letter from John H. Conway, which in turn
led to the following . . .

'Dreaming Jewels' from October 10, 1985

* The title refers to a well-known 1988 article by Richard K. Guy.

   A shape from the date of Guy's reported death

Thursday, February 15, 2024

The Isotropic Die

Filed under: General — Tags: , , , , , — m759 @ 11:20 am

Related material:  Theodore Sturgeon's novel The Dreaming Jewels
and his story "What Dead Men Tell. . .

Saturday, October 21, 2023

“Proof of Concept” at The New York Times

Filed under: General — Tags: , , — m759 @ 6:11 pm

About the author of the above —

A related questionable "proof of concept" :

Aitchison at Hiroshima in this  journal — a scholar's 2018 investigation
of M24  actions on a cuboctahedon —  and . . .

'Dreaming Jewels' from October 10, 1985

Sunday, September 10, 2023

For Orson Welles and Yul Brynner

Filed under: General — Tags: , , — m759 @ 7:47 am

Two examples from the Wikipedia article  "Archimedean solid" —

Iain Aitchison said in a 2018 talk at Hiroshima that
the Mathieu group M24  can be represented as permuting
naturally the 24 edges  of the cuboctahedron.

The 24 vertices  of the truncated  octahedron are labeled 
naturally by the 24 elements of S4  in a permutahedron —

Can M24  be represented as permuting naturally
the 24 vertices  of the truncated octahedron?

Related material from the day Orson Welles and Yul Brynner died —

'Dreaming Jewels' from October 10, 1985

Tuesday, March 21, 2023

The Long March

Filed under: General — m759 @ 11:37 am

The Slow Children  Meet  Aitchison .

Monday, October 10, 2022

Hidden Structure

The following note from Oct. 10, 1985, was not included
in my finitegeometry.org/sc pages.

'Dreaming Jewels' from October 10, 1985

See some related group actions on the cuboctahedron at right above.

Tuesday, September 6, 2022

Gell-Mann Meets Bosch* at Hiroshima

Filed under: General — Tags: — m759 @ 3:18 am

Gell-Mann Meets Bosch . . .

At Hiroshima . . .

Iain Aitchison's 'dice-labelled' cuboctahedron at Hiroshima, March 2018

* The Bosch  cuboctahedron is from an exhibition at Napoli in 2021.

See also, from that exhibition's starting date,
the Log24 post Desperately Seeking Symmetry.

Sunday, September 4, 2022

Dice and the Eightfold Cube

Filed under: General — Tags: , , , , — m759 @ 4:47 pm

At Hiroshima on March 9, 2018, Aitchison discussed another
"hexagonal array" with two added points… not at the center, as
in the Gell-Mann picture above, but rather at the ends  of one of
a cube's four diagonal axes of symmetry.

See some related illustrations below. 

Fans of the fictional "Transfiguration College" in the play
"Heroes of the Fourth Turning" may recall that August 6,
another Hiroshima date, was the Feast of the Transfiguration.

Iain Aitchison's 'dice-labelled' cuboctahedron at Hiroshima, March 2018

The exceptional role of  0 and  in Aitchison's diagram is echoed
by the occurence of these symbols in the "knight" labeling of a 
Miracle Octad Generator octad —

Transposition of  0 and  in the knight coordinatization 
induces the symplectic polarity of PG(3,2) discussed by 
(for instance) Anne Duncan in 1968.

Tuesday, July 12, 2022

Monday, July 4, 2022

Theatrical Hiroshimas

Filed under: General — m759 @ 3:47 pm

Easter Eigg

Filed under: General — m759 @ 2:47 pm

The Feast of St. Donnán is on April 17.

Friday, April 29, 2022

Code Bleu

Filed under: General — Tags: , , , — m759 @ 2:17 pm

From The New York Times  on May 5, 2011 —

"… What Paris says to me is love story, awash with painters,
shots of the Seine, Champagne. Thank God I have a
can’t-miss notion to sell you. I call it ‘Midnight in Paris.’ ”

“Romantic title,” I had to admit. “Is there a script?”

“Actually, there’s nothing on paper yet, but I can spitball
the main points,” he said, slipping on his tap shoes.

“Maybe some other time,” I said, mindful of Cubbage’s
unbroken string of theatrical Hiroshimas.

— Woody Allen

The above passage is in memory of a French film director
who, like the reporter in yesterday's post Primary Colors,
reportedly died on April 21, 2022.

See also Aitchison at Hiroshima and Easter for Aitchison.

Saturday, February 5, 2022

Mathieu Cube Labeling

Filed under: General — Tags: , , , , — m759 @ 2:08 pm

Shown below is an illustration from "The Puzzle Layout Problem" —

Exercise:  Using the above numerals 1 through 24
(with 23 as 0 and 24 as ∞) to represent the points 
, 0, 1, 2, 3 … 22  of the projective line over GF(23),
reposition the labels 1 through 24 in the above illustration
so that they appropriately* illustrate the cube-parts discussed
by Iain Aitchison in his March 2018 Hiroshima slides on 
cube-part permutations by the Mathieu group M24

A note for Northrop Frye —

Interpenetration in the eightfold cube — the three midplanes —

IMAGE- The Trinity Cube (three interpenetrating planes that split the eightfold cube into its eight subcubes)

A deeper example of interpenetration:

Aitchison has shown that the Mathieu group M24 has a natural
action on the 24 center points of the subsquares on the eightfold
cube's six faces (four such points on each of the six faces). Thus
the 759 octads of the Steiner system S(5, 8, 24) interpenetrate
on the surface of the cube.

* "Appropriately" — I.e. , so that the Aitchison cube octads correspond
exactly, via the projective-point labels, to the Curtis MOG octads.

Wednesday, December 29, 2021

Throw Some Shapes

Filed under: General — Tags: — m759 @ 8:31 am

Iain Aitchison on symmetric generation of M24

Saturday, August 28, 2021

Solomon’s Super*  Cube…

Filed under: General — Tags: , , , , , , — m759 @ 1:33 pm

Geometry for Jews  continues.

210828-Golomb-2x2x2-Super_Cube.jpg (500×373)

The conclusion of Solomon Golomb's
"Rubik's Cube and Quarks,"
American Scientist , May-June 1982 —

Related geometric meditation —
Archimedes at Hiroshima
in posts tagged Aitchison.

 

* As opposed to Solomon's Cube .

Monday, May 24, 2021

Review

Filed under: General — Tags: , — m759 @ 9:02 am

From the cover of a 1971 book of stories by Zenna Henderson

The image “http://www.log24.com/log/pix07/070105-HoldingWonder.jpg” cannot be displayed, because it contains errors.

From Frame Tale (Oct. 1, 2013) —

Twenty-four Variations on a Theme of Plato

From Log24 posts tagged Aitchison

"Has time rewritten every line?" Streisand

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