Blogging seminars – a new fad!They simply do not end. Now, Cornell grads and pre-grads have started the Everything Seminar – which has absolutely brilliant discussions about the forbidden minor theorem in graph theory as well as a fascinating overview over constructing homological algebra as embedded in the theory of modules over ![\mathbb C[\epsilon]=\mathbb C[x]/(x^2)](/latexrender/pictures/db20ecd267c084ac611f9066f99436f0.png "\mathbb C[\epsilon]=\mathbb C[x]/(x^2)")
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Connected to this comes the observation that by constructing calculus using the tricks used in synthetic differential geometry, we end up with – again – modules over ![\mathbb C[\epsilon]](/latexrender/pictures/a94d9d20f94dd70edae002338a44d68d.png "\mathbb C[\epsilon]")
, and some very fascinating discussions are sparked as to subtle and interesting connections between these two viewpoints!
How on earth I am going to keep up with the interesting sprouting discussion group blogs I shall never know. Maybe it’s getting to the point where we’ll start an 
-blog?
RSS feeds available for 
I heartily support the idea of an [tex]A_\infty[/tex] blog. One direction I still haven’t written about for my [tex]\mathbb{C}[\epsilon][/tex] posts was about enriching categories over [tex]\mathbb{C}[\epsilon]-\mathbf{mod}[/tex], which with the superalgebra structure can be turned into the notion of a dg-category.