Wednesday, October 28, 2020

Autumn 2020

29 Oct 2020

Don Redmond

Algebra via geometry


Here are Don's notes for the seminar. (Version of 29 Oct 20)

Wednesday, October 21, 2020

Autumn 2020

22 Oct 2020

Jerzy Kocik

Quaternions and Alice in Wonderland


16 October was an anniversary of the discovery of quaternions.  In celebration, let's have a rather informal conversation if quaternions indeed motivated Lewis Carroll tow describe the infamous 6 o'clock mad tea-party.  For your convenience some material:


Monday, October 12, 2020

Autumn 2020

15 Oct 2020 

Anjala Babu
Finding good quantum codes using the Cartan form

Here is Anjala's paper  in Phys. Rev. A 
Here is the same text in Arxiv.  [pdf]
And here is a Wiki entry on the Cartan decomposition.

Wednesday, September 30, 2020

Autumn 2020

1 and 8 Oct 2020

Kalpa Madhava 

How to solve quaternionic quadratic equations.

Part 1 and 2.

Wednesday, September 16, 2020

Autumn 2020

17 and 24 Sep 2020

Jerzy Kocik

Taking square roots in higher dimensions

 -- spins, polarization, and a little metaphysics

[Recording of part 1]  [Recording Part 2]

Borzu shared the link with this cool video on related toy 
and this 3D-printable file .  Check it out!

See also Copernicus Theorem at Wolfram, at Cut-the-knot, at Mathematics.
Cf. Tusi couple.


Wednesday, September 9, 2020

Autumn 2020

10 Sep 2020

K.V. Shajesh 

A comment on 
"Delayed Choice and Indeterminate Past"
by Mohammad Sayeh

Shajesh suggeted:

Tuesday, September 1, 2020

Autumn 2020

3 Sep 2020

Mohammad Sayeh

Delayed Choice and Indeterminate Past


Wednesday, August 26, 2020

Resuming the seminar

27 Aug 2020

ZOOM link

An informal gathering.

We may discuss anything,
including the following books
(graphic novels on math):

1.  Andrew and Jennifer Granville, Robert J. Lewis:
     Prime Suspects: The Anatomy of Integers
     and Permutations       

2.   Sydney Padua: 
      The Thrilling Adventures of Lovelace and Babbage:
      The (Mostly) True Story of the First Computer 

3.    Apostolos Doxiadis & Christos Papadimitriou:
       Logicomix: An epic search for truth 

Don Redmond suggests yet another graphic novel:

       Hiroshi Yuki, Mika Hisaka:
       Math Girls Manga, Volume 1

Wednesday, August 12, 2020

Mathematical Summer conversations 12

13 Aug 2020

John Joseph Marchetta 

Understanding non-intuitive repulsive forces from quantum vacuum


Wednesday, August 5, 2020

Mathematical Summer Conversations 11

6 Aug 2020

Christian Rose

An Introduction to Python Through the Apollonian Gasket


Friday, July 17, 2020

Mathematical Summer Conversations 10

:Jupyter logo - from the Wiki
23 and 30 July

Philip Feinsilver

Wrapped with Python

Part 1:  Recording
Part 2:  Recording

Wednesday, July 8, 2020

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:
For part 2: