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.