3 problems

Let $\operatorname{Ann}$ be the annulus semigroup and let … be the stated central extension. Diffeological universality conjecture. This extension is a universal central extension…

Universality conjecture. This central extension is a universal central extension. The claim concerns universality in the category of central extensions of the annulus semigroup. Th…

Let $\operatorname{Witt}^{in}$ be the cone of inward-pointing vector fields on $S^1$, and let $\cP$ be the set of smooth paths $[0,1]\to\operatorname{Witt}^{in}$. A path is geometr…