Over the past 10-12 years, geometric topology has entered a new era. Most of the foundational problems are solved, and there’s a fairly isolated collection of foundational problems remaining. 2,085 more words

## Tags » 3-manifolds

#### A celebration of diagrammatic algebra

Relaxing from my forays into information and computation, I’ve recently been glancing through my mathematical sibling Kenta Okazaki’s thesis, published as:

987 more wordsK. Okazaki, The state sum invariant of 3–manifolds constructed from the linear skein.

#### Div, grad, curl and all this

The title of this post is a nod to the excellent and well-known *Div, grad, curl and all that* by Harry Schey (and perhaps also to the lesser-known… 4,023 more words