Mathematical Summer Conversations 11

6 Aug 2020

Christian Rose

An Introduction to Python Through the Apollonian Gasket

 Recording

Mathematical Summer Conversations 10

:Jupyter logo - from the Wiki

23 and 30 July

Philip Feinsilver

^Wrapped with Python

Part 1:  Recording

Part 2:  Recording

Mathematical Summer Conversations 8 and 9

9 and 16 July 2020
Jerzy Kocik
Apollonian depth fractal 
      -- an unexpected addendum
(spinors, Dedekind, and more)

Recording - part 1 -- sorry for the ink bleeding.  Never again a pen in PowerPoint! 
Recording - part 2 

Related texts:

• Apollonian depth and the accidental fractal (35 pages, arXiv:2002.04135) 
• Spinors and the Descartes configuration of circles , (21 pages, arXiv:1909.06994) 

For part 2:

• On a Diophantine equation that generates all integral Apollonian disk packings ISNR Geometry, 17 2007 pp. 71-93.
• Spinors, lattices, and classification of integral Apollonian disk packings. (35 pages, arXiv:2001.05866)
• On the Dedekind tessellation (16 pages, arXiv:1912.05768)
• The Dedekind tessellation by Lievenlb.

Mathematical Summer Conversations 7

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2 July 2020

Dinush Lanka
Ford circles and spin networks

Recording

Mathematical Summer Conversations 6

25 June 2020

Robert Owczarek
Kauffman,  Chebyshev, Fibonacci, Lucas

Recording

Mathematical Summer Conversations 5

18 June 2020
Mike Sullivan
Lens spaces

• Recording
• Slides from the talk 
• The table
• References

Mathematical Summer Conversations 4

Eugène Charles Catalan

11 June 2020

Philip Feinsilver

Factorials, Catalan's, Krawtchouk's

Suggested pre-presentation reading

• Recording (with occasional tech problems)
• Notes from the talk
• Here a Krawtchouk matrices for your experimentation (for instance try to square them...)

Mathematical Summer Conversations 3

4 June 2020

Hanna Makaruk
Uncertainty about Uncertainty
Hanna's talk  (pdf slides)

Hanna's email:  <hanna_m@lanl.gov>
She invites comments, questions, and suggestions.

Mathematical Summer Conversations 2

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28 May 2020
Borzu Toloui 
A short introduction to Constructor Theory: A new mode of explanation in physics and beyond

• Recording of the meeting 
• Constructor Theory Homepage

If you are interested, please send your questions to Borzu or me, or add them to the comments area.  We will ask Borzu for another Q&A session in the near future.

Mathematical Summer Conversations

21 May 2020
John McSorley
Combinatorial miscellanea and gossip

Here is the PDF of the talk.

Recording:  1. The first 2 min.  2. The main body, 50 min.

connections

14 May, 2020 

Philip Feinsilver

Secret passage through Lie algebras, recurrences, and polynomials

• Recording (about 1 hr)
• File from the talk (annotated, 5MB)
• The same file, clean  (69 KB)

Light

From https://meanjin.com.au/blog/the-slow-light-of-truth/

6 May 2020
(Note -- WEDNESDAY)

Mohammad Sayeh

Slow light  (photons calmed)


[recording]




Two papers (click): 

• Stopped light
• Slow light

And the book suggested by Mohammad:  "Fast Light, Slow Light and Left-Handed Light" by P W Milonni, 2005.  [Amazon,  PDF]

In comments use dollar signs and latex to get math formating.  For instance $\frac{7}{3}=\det\begin{bmatrix}a&b\\ c&d\end{bmatrix}$.