Chao Yang

collaborators

4 papers

math.GR2026

Topological Characterizations of Geometrically Infinite Convergence Group Actions and Orbit Uniform Metrics

Chaodong Yang

Two characterizations of geometric finiteness in terms of weaker conditions are known for actions on Gromov hyperbolic spaces. In this paper, we establish analogous characterizatio…

math.GR2026

Two Characterizations of Geometrically Infinite Actions on Gromov Hyperbolic Spaces

Chaodong Yang, Wenyuan Yang

We provide two new characterizations of geometrically infinite actions on Gromov hyperbolic spaces: one in terms of the existence of escaping geodesics, and the other via the prese…

math.QA2025

Cofiniteness for Twisted Fusion Products in Vertex Operator Algebra Theory

Chao Yang, Yiyi Zhu

Let $V$ be a vertex operator algebra equipped with two commuting finite-order automorphisms $g_{1}$ and $g_{2}$ , and set $g_{3} = g_{1} g_{2}$ . For $k = 1, 2, 3$ , let $W^{k}$ be a $g_{k}$ -twiste…

math.QA2025

Y(z)-injective vertex superalgebras and Hopf actions

Chao Yang

This paper investigates Y(z)-injective vertex superalgebras. We first establish that two fundamental classes of vertex superalgebras -- simple ones and those admitting a PBW basis…