Log24

Tuesday, April 14, 2026

Color Bodies

Filed under: General — Tags: , , — m759 @ 10:15 am

The above L2(23) is closely related to the "Seventh Seal" color bodies implied
by the conclusion of Cameron's classic Parallelisms of Complete Designs.

One such color body, from the set of 105 Klein quadric lines in brick space . . .

Friday, February 6, 2026

Lander in Artspace

Filed under: General — Tags: — m759 @ 6:01 am

Evolution of an image . . .

( Not to be confused with The Tin Man’s Hat. )

From the monograph preprint Diamond Theory  (1976) —

(See pages 2 and 3 of the monograph.)

The above theorem underlies a revised anatomy of the Fano plane . . .

The fundamental theorem, expounded further in a 2001 web page,  also
underlies the "seventh seal" derived from Peter J. Cameron's 1976 book
Parallelisms of Complete Designs — a representation of the 105 lines of the
Klein Quadric in PG(5,2) as the 105 partitions of an 8-set into four 2-sets.

Sunday, November 23, 2025

The Four-Color Monoliths

Filed under: General — Tags: , , — m759 @ 8:11 am

From other posts tagged "105 Partitions" —

Some backstory —

Saturday, October 11, 2025

Wednesday, October 8, 2025

Cube-Brick Columns

Filed under: General — Tags: , , , — m759 @ 4:58 am

This post was suggested by yesterday's update to
the "Analogy Between Analogies" post of October 6.

The reason for the above columns . . .

The action of S8 on the rows of an 8-row 3-column matrix

000
001
010
011
100
101
110
111

is intimately connected, via the 30 labelings of a Fano plane
and via the Klein quadric in PG(5, 2), with the action of a
group of order 322,560 on the 16 squares of a 4×4 array.
See Conwell, 1910 [1] and the Log24 tag 105 partitions.

1. Conwell, George M. “The 3-Space PG(3, 2) and Its Group.”
Annals of Mathematics, vol. 11, no. 2, 1910, pp. 60–76.
JSTOR, https://doi.org/10.2307/1967582.
 

For those who prefer narratives  to mathematics: The Cubes.

Sunday, September 28, 2025

For Day 28 of September 2025: Fundamental Structures

Filed under: General — Tags: , , , , — m759 @ 3:59 am

http://m759.net/wordpress/?s="Ron+Shaw"

The Klein quadric as background for
the Miracle Octad Generator of R. T. Curtis —

The Klein quadric, PG(5,2), and the 'bricks' of the Miracle Octad Generator

Saturday, September 27, 2025

Four-Color Monolith

Filed under: General — Tags: , , , — m759 @ 12:59 pm

Those who find Kubrick's black 2001 monolith too dark
may prefer a more colorful image, taken from yesterday's
post on the Klein correspondence

http://www.log24.com/log/pix11/110412-IconicArt.jpg

When?

Going to dark bed there was a square round 
Sinbad the Sailor roc’s auk’s egg
in the night of the bed of all the auks of the rocs
of Darkinbad the Brightdayler.

Where?

Black disc from end of Ch. 17 in Ulysses

— Ulysses , conclusion of Chapter 17.

Friday, September 26, 2025

On the Klein Correspondence in Finite Geometry

Filed under: General — Tags: , , , , — m759 @ 1:04 am

Illustration using Cullinane's four-color decomposition theorem

" … fare forward, voyager . . . ." — T. S. Eliot

Sunday, September 21, 2025

Klein-Space Grok

Filed under: General — Tags: , , , — m759 @ 10:38 pm

Tuesday, August 26, 2025

Using AI for Search:
Combinatorial Partitions as Projective Lines …
Within the Klein Quadric

Filed under: General — Tags: , , , — m759 @ 1:17 pm

Some backstory: yesterday's post "Using AI: Search vs. Chat."

Vide  a PDF of the complete Grok report —

In its five-and-a-half-minute research and reasoning process
Grok was able to reference a post from this weblog, but it missed
the correct  answer to the prompt — Cullinane's "four-color
decomposition theorem
" in the following weblog image:

Monday, August 25, 2025

Using AI: Search vs. Chat

Filed under: General — Tags: , , — m759 @ 10:42 pm

Adapted song lyric —
"I used Chat, Chat used me, neither one cared."

What if we read the above machine-boilerplate "Comments Off"
remark ending a May 6 Log24 post as a dramatist's note? 

Related reading — 

https://www.nytimes.com/2025/08/08/technology/
ai-chatbots-delusions-chatgpt.html
 —

"Over 21 days of talking with ChatGPT, an otherwise
perfectly sane man became convinced that he was
a real-life superhero. We analyzed the conversation.

. . . We received a full export of all of Allan Brooks’s conversations
with an OpenAI chatbot and analyzed a subset of the conversations
starting from May 6, 2025, when he began the chat about pi." 

Wednesday, August 20, 2025

Ex Fano: Dots and Lines . . . Revisited

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

Partitions  of an 8-set into four 2-sets are related to
lines in projective geometry as follows . . .

Friday, August 15, 2025

Castle in the Air
from the Sept Tours Foundation

Filed under: General — Tags: — m759 @ 12:39 pm

Pinterest suggests that an image of the CGI castle Sept Tours
should be saved to the board "Binary Galois Spaces" —

Already there.

  Partitions  of an 8-set into four 2-sets are related to
lines in projective geometry as follows . . .

A related castle from a Groundhog Day Depth Haiku  post —

Search History — 105 lines in PG(5,2)

Filed under: General — Tags: — m759 @ 6:15 am

A search from August 15 —

Note:  Partitions of an 8-set into four 2-sets are related to
           lines  in projective geometry as follows . . .

Thursday, August 14, 2025

The Klein Quadric and 105 Lines

Filed under: General — Tags: , — m759 @ 7:20 pm

Earlier Log24 posts tagged 105 Partitions suggest a look at . . .

Version 4 of the above paper is at https://arxiv.org/abs/2105.13798.

See also this  journal on the Version 2 date — April 9, 2022 —
a post titled Academic Rhetoric on visual diagrams in mathematics.

Thursday, May 22, 2025

Four-Color Decomposition and the Klein Correspondence

Filed under: General — Tags: , — m759 @ 7:45 pm

Ron Shaw in "Configurations of planes in PG(5,2)" . . .

"There are some rather weird things happening here."

Friday, April 11, 2025

Brick Space: The Yellow Brick* Road Now and in 2014

Filed under: General — Tags: , , , — m759 @ 12:20 pm

Now —

… and in 2014 —

* "Brick" is a term coined by R. T. Curtis that denotes any of the three
4-row 2-column arrays that form his 4-row 6-column Miracle Octad Generator.

Thursday, August 15, 2024

Geometry Exercise

Filed under: General — Tags: — m759 @ 11:00 pm

As G. M. Conwell pointed out in a 1910 paper, the group of all
40,320 permutations of an 8-element set is the same, in an
abstract sense, as the group of all collineations and dualities
of PG(3,2), the projective 3-space over the 2-element field.

This suggests we study the geometry related to the above group's
actions on the 105 partitions of an 8-set into four separate 2-sets.

Note that 105 equals 15×7 and also 35×3.

In such a study, the 15 points of PG(3,2) might correspond (somehow)
to 15 pairwise-disjoint seven-element subsets of the set of 105 partitions,
and the 35 lines of PG(3,2) might correspond (somehow) to 35 pairwise-
disjoint three-element subsets of the set of 105 partitions.

Exercise:  Is this a mere pipe dream?

A search for such a study yields some useful background . . .

.

Taylor's Index of Names  includes neither Conwell nor the
more recent, highly relevant, names Curtis  and Conway .

Friday, July 5, 2024

De Bruyn on the Klein Quadric

Filed under: General — Tags: , , , , — m759 @ 10:31 pm

— De Bruyn, Bart. “Quadratic Sets on the Klein Quadric.”
JOURNAL OF COMBINATORIAL THEORY SERIES A,
vol. 190, 2022, doi:10.1016/j.jcta.2022.105635.

Related material —

Log24 on Wednesday, July 3, 2024: "The Nutshell Miracle" . . .

In particular, within that post, my own 2019 "nutshell" diagram of PG(5,2):

PG(5,2)

Monday, September 15, 2014

A Seventh Seal

Filed under: General,Geometry — Tags: , , , — m759 @ 10:00 am

This post was suggested by the two previous posts, Sermon and Structure.

IMAGE- Epigraph to Ch. 7 of Cameron's 'Parallelisms of Complete Designs'- '...fiddle with pentagrams...' from 'Four Quartets'

Vide  below the final paragraph— in Chapter 7— of Cameron's Parallelisms ,
as well as Baudelaire in the post Correspondences :

Comme de longs échos qui de loin se confondent
Dans une ténébreuse et profonde unité….

— Baudelaire, "Correspondances "

Cameron on resolutions and the 105 partitions of an 8-set into 2-sets

A related image search (click to enlarge):

Thursday, December 5, 2002

Thursday December 5, 2002

Sacerdotal Jargon

From the website

Abstracts and Preprints in Clifford Algebra [1996, Oct 8]:

Paper:  clf-alg/good9601
From:  David M. Goodmanson
Address:  2725 68th Avenue S.E., Mercer Island, Washington 98040

Title:  A graphical representation of the Dirac Algebra

Abstract:  The elements of the Dirac algebra are represented by sixteen 4×4 gamma matrices, each pair of which either commute or anticommute. This paper demonstrates a correspondence between the gamma matrices and the complete graph on six points, a correspondence that provides a visual picture of the structure of the Dirac algebra.  The graph shows all commutation and anticommutation relations, and can be used to illustrate the structure of subalgebras and equivalence classes and the effect of similarity transformations….

Published:  Am. J. Phys. 64, 870-880 (1996)


The following is a picture of K6, the complete graph on six points.  It may be used to illustrate various concepts in finite geometry as well as the properties of Dirac matrices described above.

The complete graph on a six-set


From
"The Relations between Poetry and Painting,"
by Wallace Stevens:

"The theory of poetry, that is to say, the total of the theories of poetry, often seems to become in time a mystical theology or, more simply, a mystique. The reason for this must by now be clear. The reason is the same reason why the pictures in a museum of modern art often seem to become in time a mystical aesthetic, a prodigious search of appearance, as if to find a way of saying and of establishing that all things, whether below or above appearance, are one and that it is only through reality, in which they are reflected or, it may be, joined together, that we can reach them. Under such stress, reality changes from substance to subtlety, a subtlety in which it was natural for Cézanne to say: 'I see planes bestriding each other and sometimes straight lines seem to me to fall' or 'Planes in color. . . . The colored area where shimmer the souls of the planes, in the blaze of the kindled prism, the meeting of planes in the sunlight.' The conversion of our Lumpenwelt went far beyond this. It was from the point of view of another subtlety that Klee could write: 'But he is one chosen that today comes near to the secret places where original law fosters all evolution. And what artist would not establish himself there where the organic center of all movement in time and space—which he calls the mind or heart of creation— determines every function.' Conceding that this sounds a bit like sacerdotal jargon, that is not too much to allow to those that have helped to create a new reality, a modern reality, since what has been created is nothing less."

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