Arcadian Functor

occasional meanderings in physics' brave new world

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Marni D. Sheppeard

Tuesday, March 13, 2007

Riemann Rolls On

Since Never Ending Books and Noncommutative Geometry seem to have initiated a carnival of posts on the Riemann hypothesis, let us continue also in this vein.

Shifting from drawing trees with lines to drawing them with ribbons, we find that some alterations are permitted. A Y vertex with lines looks the same upward (product) as it does downward (coproduct). With ribbons, we might have diagrams like this which were considered by Kauffman et al in studying invariants for templates. An example of a template is the one for the Lorenz attractor, namely where the ribbons are permitted to curl around via cap elements. The study of templates and knots took off with the work of Joan Birman et al on the periodic orbits of the Lorenz system. Knots correspond to words in the 2 letters defined by the holes in the template, around which one draws knots. Robert Ghrist came up with a 4 holed template, which is universal for knots and links.


Anonymous Doug said...

On the Robert Ghrist page, lower right corner, is a diagram that is close to what I call architectural geometry.

The primary difference is that my cylinders are "virtual" while the helical geodesics are trajectories.

My virtual cylinders are also perturbed.

March 13, 2007 3:51 PM  

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