Kai Fang

collaborators

3 papers

math.FA2026

Extreme points of the unit balls and isometries of noncommutative quasi-Banach Marcinkiewicz spaces

Kai Fang, Yi Gao, Jinghao Huang +1

We characterize extreme points of the (positive) unit balls of Marcinkiewicz spaces with respect to their natural quasi-norms. Having these results at hand, we show that every posi…

math.OA2026

Jensen' s trace inequality with equality condition and noncommutative Lamperti's theorem

Kai Fang, Xin He, Jinghao Huang

Let $M$ be a semifinite von Neumann algebra equipped with a semifinite faithful normal trace $τ$ . We establish Jensen's trace inequality in full generality and characteriz…

math.FA2026

Disjointness-preserving mappings on Calkin operator spaces and positive isometries

Kai Fang, Jinghao Huang, Karimbergen Kudaybergenov +1

Let $E (M, τ)$ and $F (M, τ)$ be two Calkin operator spaces affiliated with a semifinite von Neumann algebra $M$ equipped with a semifinite faithful norma…