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.  

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.

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. 

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.

Fibonacci numbers

9 Apr 2020

Jerzy (Jurek) Kocik

Fibonacci sequence and Ford circles


For more, see  arXiv:2003.00852