Tuesday, April 28, 2020

Origami

30 April 2020

William Holt

Origami, math between the sheets (of paper)

Recording (59 min).

William goes over a number of things, which include his method of folding paper into n equal sections for arbitrary n.  


Sunday, April 26, 2020

Interlude


Two items:


The text Christian Rose mentioned (and currently reads) can be downloaded here.   (It contains a nice chapter on math of lattices.)    See also the lectures recorded at Oxford Thanks, Christian.


The lectures on Knot Theory started.  Here are recordings of the first four:
Lecture 1 (Roger Fenn)
Lecture 2 (Louis Kauffman)
Lecture 3  (Roger Fenn)
Lecture 4  (Louis Kauffman)
Lecture 5  (Roger Fenn, 1 May)

Yous probably remember Louis from his visits at Carbondale.


Monday, April 20, 2020

negative mass

Click on the image to see details

23 April 2020

Moses Gaither-Ganim

Minus matter: the possibility of negative mass

[Recording] - the first few minutes are missing, but can easily be reconstructed from the whiteboard. 


Monday, April 13, 2020

Origami geometry

16 April 2020

William Holt

Pentagons from paper, development of division in ancient art

  <<< click on the image to enlarge




Please prepare at least 5 sheets of letter size paper for folding. 

Here is the recording of the meeting.




Wednesday, April 8, 2020

Fibonacci numbers

9 Apr 2020

Jerzy (Jurek) Kocik

Fibonacci sequence and Ford circles


For more, see  arXiv:2003.00852





Friday, February 28, 2020

Can get it here
5 Feb 2020

Don Redmond

When are Rectangles Squares?

Thursday, February 27, 2020

27 Feb 2020

Kalpa Madhawa

Quaternionic eigenvalues

Thursday, February 20, 2020

From Arts Bathsheba
20 Feb 2020

Duston Wetzel

On gyroid


Gyroid was discovered by our own Alan Schoen and is enjoing an increasing general popularity in sience and in in general math culture


Tuesday, February 4, 2020

Ford and scattering



6 and 13 Feb 2020 

K.V Shajesh

Rayleigh scattering off Ford circles


Saturday, January 18, 2020

Math from physics

23 and 30 Jan 2020

Philip Feinsilver

Eigenvectors from eigenvalues

>> Relevant paper on Arxiv
>> Quanta Magazine on this subject

  <<  see the original image

  Philip's presentation  (NEW)
 plus this page.

Thursday, November 14, 2019

Symmetry


21 November and
and 5 December 2019

Thushari Jayasekera

Symmetry in Materials Physics

← click to view details.

Tuesday, November 12, 2019

Geometry and numbers

From Fine Art America
14 Nov 2019

Don Redmond

Polygonal numbers as differences of squares