4 problems

Let $\hat {\Cal D}_{an}$ be the universal central extension of the group of analytic, orientation-preserving diffeomorphisms of $S^1$, acting on a completion of $\Cal D_{an}$, and…

Let $A=\{1\leq |z|\leq r\}$ with $r>1$, let $K$ be a $\mathbb{C}^*$-rectangle with $\overline{K}\subset\operatorname{int}(A)$ that is not a $\mathbb{C}^*$-square, and let … be a me…

A Schottky set is the complement in $\widehat{\mathbb C}$ of a union of disjoint open disks. A local quasisymmetric symmetry is a locally defined quasisymmetric self-homeomorphism…

Let $F_{K\text{-qs}}(\alpha)$ and $B_{K\text{-qs}}(t)$ denote the universal integral means spectra for $K$-quasisymmetric maps, with the bounds and parameter ranges stated in Theor…