Zhengyi Zhou

activity

20242026

collaborators

6 papers

cs.CR2026

Differentially Private Hierarchical Heavy Hitters

Ari Biswas, Graham Cormode, Yaron Kanza +2

The task of finding _Hierarchical_ Heavy Hitters (HHH) was introduced by Cormode et al. [VLDB 2003] as a generalisation of the heavy hitter problem. While finding HHH in data strea…

cond-mat.str-el2026

Self-dual Higgs transitions: Toric code and beyond

Wenjie Ji, Ryan A. Lanzetta, Zheng Zhou +1

The toric code, when deformed in a way that preserves the self-duality $Z_{2}$ symmetry exchanging the electric and magnetic excitations, admits a transition to a topologica…

math.SG2025

Unknottedness of symplectic submanifold fillings

Zhengyi Zhou

We show that any symplectic filling of the standard contact submanifold $(S^{2 n - 1}, I^¾_{std})$ of $(S^{2 n + 1}, I^¾_{std})$ in $(\mathbb{D}^{n+1},Ï_…

math.SG2024

Algebraically overtwisted tight $3$ -manifolds from $+ 1$ surgeries

Youlin Li, Zhengyi Zhou

We execute Avdek's algorithm to find many algebraically overtwisted and tight $3$ -manifolds by contact $+ 1$ surgeries. In particular, we show that a contact $1/ k$ surgery on the st…

math.CV2024

Bounding smooth Levi-flat hypersurfaces in a Stein manifold

Hanlong Fang, Xiaojun Huang, Wanke Yin +1

This paper is concerned with the problem of constructing a smooth Levi-flat hypersurface locally or globally attached to a real codimension two submanifold in $C^{n + 1}$ , or…

math.SG2024

Bourgeois' contact manifolds are tight

Russell Avdek, Zhengyi Zhou

We prove that Bourgeois' contact structures on $M \times T^{2}$ determined by the supporting open books of a contact manifold $(M, I^¾)$ are always tight. The proof is base…