Tag: Depth Page 1 of 2

Two Types of Symmetry

Mathematical Literary (also from May 18, 2010)

Three Constructions of the Miracle Octad Generator

See also a Log24 post on this subject from Dec. 14, 2013, especially (scroll down) the update of March 9, 2014. Related material on the Turyn-Curtis construction from the…

Classical Galois

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Depth

"… this notion of ‘depth’ is an elusive one even for a mathematician who can recognize it…." — G. H. Hardy,  A Mathematician's Apology Part I:  An Inch…

Hesse's Table

From “Quartic Curves and Their Bitangents,” by Daniel Plaumann, Bernd Sturmfels, and Cynthia Vinzant, arXiv:1008.4104v2  [math.AG] 10 Jan 2011 — The table mentioned (from 1855) is… Exercise: Discuss the relationship,…

Sermon

On Theta Characteristics — From Zentralblatt-math.org.  8 PM ET update:  See also a related search. Some may prefer a more politically correct— and simpler— sermon. Background for the…

Conwell Heptads in Eastern Europe

“Charting the Real Four-Qubit Pauli Group via Ovoids of a Hyperbolic Quadric of PG(7,2),” by Metod Saniga, Péter Lévay and Petr Pracna, arXiv:1202.2973v2 [math-ph] 26 Jun 2012 — P….

Kummer Varieties

The Dream of the Expanded Field continues… From Klein's 1893 Lectures on Mathematics — "The varieties introduced by Wirtinger may be called Kummer varieties…." — E. Spanier, 1956 From…

Rosenhain and Göpel Again

See also Rosenhain and Göpel in the Wikipedia article Kummer surface, and in this journal. Related material: user @hyperelliptic on Twitter.

Rosenhain and Göpel

(Continued) See The Oslo Version in this journal and the New Year’s Day 2014 post. The pictures of the 56 spreads in that post (shown below) are based on the 20 Rosenhain and 15 Göpel tetrads…