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 . . .
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 . . .
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.
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.
http://m759.net/wordpress/?s="Ron+Shaw" —
The Klein quadric as background for
the Miracle Octad Generator of R. T. Curtis —
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 —
Illustration using Cullinane's four-color decomposition theorem —
" … fare forward, voyager . . . ." — T. S. Eliot
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:

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."
Partitions of an 8-set into four 2-sets are related to
lines in projective geometry as follows . . .
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 —
A search from August 15 —
Note: Partitions of an 8-set into four 2-sets are related to
lines in projective geometry as follows . . .

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.
Ron Shaw in "Configurations of planes in PG(5,2)" . . .
"There are some rather weird things happening here."
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.
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 .

— 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)

This post was suggested by the two previous posts, Sermon and Structure.
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 "
A related image search (click to enlarge):
Powered by WordPress