Log24

Friday, November 1, 2013

Cameron’s Group Theory Notes

Filed under: General,Geometry — Tags: , — m759 @ 7:00 AM

In "Notes on Finite Group Theory"
by Peter J. Cameron (October 2013),
http://www.maths.qmul.ac.uk/~pjc/notes/gt.pdf,
some parts are particularly related to the mathematics of
the 4×4 square (viewable in various ways as four quartets)—

  • Definition 1.3.1, Group actions, and example on partitions of a 4-set, p. 19.
  • Exercise 1.1, The group of Fano-plane symmetries, p. 35.
  • Exercise 2.17, The group of the empty set and the 15 two-subsets of a six-set, p. 66.
  • Section 3.1.2, The holomorph of a group, p. 70.
  • Exercise 3.7, The groups A8 and AGL(4,2), p. 78.

Cameron is the author of Parallelisms of Complete Designs ,
a book notable in part for its chapter epigraphs from T.S. Eliot's
Four Quartets . These epigraphs, if not the text proper, seem
appropriate for All Saints' Day.

But note also Log24 posts tagged Not Theology.

Monday, October 14, 2013

Up and Down

Filed under: General — Tags: , — m759 @ 9:29 AM

Heraclitus, Fragment 60 (Diels number):

The way up and the way down is one and the same.

ὁδὸς ἄνω κάτω μία καὶ ὡυτή

hodòs áno káto mía kaì houté

— http://www.heraclitusfragments.com/B60/index.html

IMAGE- Fetzer on ambiguity in Mann's 'Doctor Faustus'

See also Blade and Chalice and, for a less Faustian
approach, Universe of Discourse.

IMAGE- Logic related to 'the arsenal of algebraic analysis tools for fields'

Further context:  Not Theology.

Monday, October 7, 2013

Post-Production (continued)

Filed under: General,Geometry — Tags: , — m759 @ 1:00 PM

This journal on Oct. 2, the date of death for
the developer of mathematical Braille —

Clicking on the image of St. Peter's Square in that post led to

Braille, as noted in last midnight's post, is based
on a six-dot cell. For some pure mathematics of
the six-dot cell, see 

Modeling the 21-point plane
with outer automorphisms of S6

Two quotations that seem relevant —

"When Death tells a story, you really have to listen"
Cover of The Book Thief

"This is not theology, this is mathematics."
Steven H. Cullinane, Sept. 22, 2013

Sunday, September 22, 2013

Incarnation, Part 2

Filed under: General,Geometry — Tags: , , — m759 @ 10:18 AM

From yesterday —

"…  a list of group theoretic invariants
and their geometric incarnation…"

David Lehavi on the Kummer 166 configuration in 2007

Related material —

IMAGE- 'This is not mathematics; this is theology.' - Paul Gordan

"The hint half guessed, the gift half understood, is Incarnation."

T. S. Eliot in Four Quartets

"This is not theology; this is mathematics."

— Steven H. Cullinane on  four quartets

To wit:


Click to enlarge.

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