about 5 months ago - 4 comments
To most mathematicians, a good LaTeX-frontend (such as TeXShop for Mac-users) is the crucial tool to get the work done. We use it to draft ideas, write papers and courses, or even to take notes during lectures. However, after six years of blogging, my own LaTeX-routine became rusty. I rarely open a new tex-document, and
about 6 months ago - No comments
Here’s a tiny problem illustrating our limited knowledge of finite fields : “Imagine an infinite queue of Knights , waiting to be seated at the unit-circular table. The master of ceremony (that is, you) must give Knights and a place at an odd root of unity, say and , such that the seat at the
about 1 year ago - 4 comments
I really like Matilde Marcolli’s idea to use some of Jackson Pollock’s paintings as metaphors for noncommutative spaces. In her talk she used this painting and refered to it (as did I in my post) as : Jackson Pollock “Untitled N.3”. Before someone writes a post ‘The Pollock noncommutative space hoax’ (similar to my own
about 1 year ago - 1 comment
Are the valencies of the 171 moonshine groups are compatible, that is, can one construct a (disconnected) graph on the 171 vertices such that in every vertex (determined by a moonshine group G) the vertex-valency coincides with the valency of the corresponding group? Duncan describes a subset of 9 moonshine groups for which the valencies
about 1 year ago - 7 comments
While the verdict on a neolithic Scottish icosahedron is still open, let us recall Kostant’s group-theoretic construction of the icosahedron from its rotation-symmetry group . The alternating group has two conjugacy classes of order 5 elements, both consisting of exactly 12 elements. Fix one of these conjugacy classes, say and construct a graph with vertices
about 1 year ago - 15 comments
A truly good math-story gets spread rather than scrutinized. And a good story it was : more than a millenium before Plato, the Neolithic Scottish Math Society classified the five regular solids : tetrahedron, cube, octahedron, dodecahedron and icosahedron. And, we had solid evidence to support this claim : the NSMS mass-produced stone replicas of
about 1 year ago - 1 comment
Today, Alain Connes and Caterina Consani arXived their new paper Schemes over and zeta functions. It is a follow-up to their paper On the notion of geometry over , which I’ve tried to explain in a series of posts starting here. As Javier noted already last week when they updated their first paper, the main
about 1 year ago - 1 comment
Last time I promised to come back explaining how to set-up LaTeX-support, figuring I had to tell you about a few modifications I had to make in order to get Latexrender run on my mac… A few google searches made it plain how out of touch I am on these matters (details below). But first,
about 1 year ago - No comments
Set up your own WPMU+BuddyPress site on a spare Mac in no time.
about 1 year ago - 1 comment
Tim Gowers’ dream of massively collaborative mathematics got me thinking…